This escalation took place while vessels have called at the Israeli ports and others were on their way, or were expected to be on their way, to an Israeli port, as their ports of nomination or .destination, raising the concepts of "War", "Acts of War", which will be reviewed in this Article.
The concept of "War" or "Acts of War" can be found in many formulations related to shipping industry and maritime law. An "Act of War" is one of the defences available to the carrier exempting his liability from loss to cargo under his care, under the Hague -Visby Rules, listed together with "Peril of the Sea" at the sub clauses of Article IV of the Rules.; it is a risk covered by the Institute War Clauses (Cargo), according to, the insurance covering loss or damage to the subject-matter insured, caused by "war, civil war, revolution, rebellion and insurrection". According to the ASBATANKVOY charterparty form, the charterer is entitled to avoid loading or discharging at a nominated port if "owing to any war, hostilities, warlike operations, civil war…" the entry to such port or the loading or discharge of cargo at any such port is considered by the Master or owners in his or their discretion, dangerous or prohibited; "SHELL TIME 4", provides, under clause 33 that both the owners and the charterers have the right to cancel the charterparty if a war or hostilities break out between two or more of the following countries: The U.S.A, the countries having been part of the former U.S.S.R, P.R.C, U.K, the Netherlands. Under clause 34, if the vessel is ordered to trade in areas where there is war (de facto or de jure) or threat of war, charterers shall reimburse the owners for any additional insurance premia, crew bonuses and other expenses which are reasonably incurred by owners as a consequence of such orders. Also, under clause 35 (a) the master shall not be required to sign bills of ladings for any place in which in his or owner's reasonable opinion it is impossible or dangerous for the vessel to enter or reach owing to blockade, war, hostilities, warlike operations, civil war.
Under the BP OIL INTERNATIONAL General Terms & Conditions for Sales and Purchases of Crude Oil and Petroleum Products, 2015 Edition, Section 65 the events such as "war, whether declared or not, civil war, riots and revolutions, acts of piracy" are listed as Force Majeure events- impediments which are beyond the control of the Buyer or the Seller, allowing them to suspend their performances and obligations under the purchase and sale agreement.
In the matter of Kawasaki v. Banthem Steam Ship Company  2 K.B. the charterparty provided that: "Charterers and Owners to have the liberty if canceling the charter party if war break out involving Japan". The owners purported to cancel the charterparty on the grounds that a war broke out, and the owners argued that the cancelation was wrongful and claimed damages. At the time of cancelation, no declaration of war was made by Japan or the U.K in relation to the other and diplomatic relations continued between the countries and the UK government, in the words of a letter from the Foreign Office, were "not prepared to say that in their view a state of war existed" .Nevertheless, at the same time hundreds of thousands of Japanese soldiers were engaged in battles with hundreds of thousands Chinese soldiers and Japan was maintaining a naval blockade over a 1,000 mile stretch of the coastline of China. The arbitral umpire held that if and as it was a question of fact, war had broken out involving Japan. The Court of Appeal rejected the argument that, for the purpose of construction of the clause the word "war" had any technical meaning derived from international law. The views of the UK government were not conclusive. The matter was to be decided in a "common sense way": What would a commercial person exercising common sense say if the nation in question was involved in a war? On the facts he would say that Japan was involved in the war.
The conclusion drawn by Ewan Mckendrick, in "Force Majeure and Frustration of Contracts" from the matter of Kawasaki v. Banthem Steam Ship, in relation to the construction of the commercial contracts using the term "War", is that whether a country is involved in a war is to be answered by common sense, and that the fact that no declaration of war has been made is not conclusive. Nations may claim that they are in a state of war with each other without there being any actual fighting on the ground, at sea or in the air (such was the position for many years between Egypt and Israel until their final peace treaty in 1979, when heavy fighting took place in 1948, 1956, 1967, 1973). On the other hand, the fact that diplomatic relations are not broken off, is not a conclusive factor against the existence of a war. Today, the existence of a state of war may not only be difficult to describe but also difficult to recognize, and the meaning of "War" may change with the passing of time. For example, during the Falkland Islands war British ships were free to trade to parts in Argentine and Argentinean property in the UK was not sequestrated. 
The case of Spinney's (1948) Ltd v. Royal Assurance, concerned an incident where groups of people broke into and looted the assured's shop in Spinney's Center in the middle on Beirut on 18 January 1976, during internal political strife, accompanied by violence and destruction on a large scale suffered by Lebanon and the City of Beirut for several months. The Court (Mustill J) held that at that time there were no "sides" which could be identified as being engaged in a civil war and that although the fighting in Lebanon was serious the violence was sporadic, and had not advanced beyond massive civil strife and anarchy and did not reach a stage of "civil war". 
In the matter of the Northern Pioneer  1 Lloyd's Rep. 212, On 29 April 1999 the charterers purported to cancel the charterparty for the chartering of four German flag ships, relying on a clause similar to the above-mentioned clause 33 of the SHELL TIME 4" and under circumstances where from 24 March, 1999, Germany, as a member of NATO, participated in the military operations in Kosovo, by deployment of a number of air craft of the German Air Force. The majority of the arbitrators held that a businessman applying common sense in the contents of the war cancelation clause would not regard the NATO operation in Kosovo as a war, while the minority arbitrator considered that if a business man had been asked whether there was a war in Kosovo in March and April 1999 he would have said "yes" and Germany was involved in the conflict. However, the arbitrators were unanimous in holding that the charterers should have exercised the option to cancel the charterparty within a reasonable time and the charterers had not done so. Therefore, the Court of Appeal did not determine between the different views between the arbitrators, although the majority decision was "open to serious doubt" .
In the matter of If P & C Insurance v. Silversea Cruises, the operator of a fleet of four ultra-luxury cruise ships claimed loss of income and anticipated income due to the impacts of the 9/11 attacks and the subsequent US government warning US citizens making travel plans, on its activities, such as- the closing of New-York Port which remained closed to cruise ships until April 2012 , passengers' cancelations of cruises, drop in bookings, resulting also with the lay up of one of its four vessels for the balance of 2001 season and the whole of 2002 season, operating temporarily during that period with a three ship fleet. The claim was filed on the grounds of a "Loss of Income and Extraordinary Costs" insurance policy, covering the assured loss of income and loss of expected income, inter alia, as a result of "Acts of war, armed conflict, strikes, riots and civil commotions which interfere with the scheduled itinerary of the insured vessel, whether actual or threatened." The claim for the loss of income related to the lay-up of one of the vessels was dismissed as the insurance argument that the decision to take a vessel out of the circulation was not the 9/11 attack but over-capacity and the matter of "war" or "acts of war" was not addressed directly by High Court and the Court of Appeal. However, under few brief comments provided by Lord Justice Rix he expressed his opinion that "acts of war and "armed conflicts" might be broader than war itself, and that it might be that a causa belli, and as much as the 9/11 attacks led to the invasion to Afghanistan- is can be argued as being a candidate to an 'act of war'. He also mentioned that the fact that the 9/11 attacks were an example of a terrorist's attacks does not, for itself, answer the question whether it amounted to something more. Meaning, that considering the structure, of Al Qaeda, its ideology and aims and its relationship with the Taliban, the 9/11 attack might be considered also as an "act of war" -which usually takes place between two states. However, this issue was not decided by the Court.
The matter of a tanker chartered under a voyage charter and the influence of a military escalation in Israel has been dealt with under a Supreme Court Judgment in civil appeal 7802/11 TRANS KA TANKERS Vs. VITOL ENERGY S.A. In that matter, under a fixture dated 26.07.2006 the vessel Bereket Va had been chartered for the carriage of 5,000 tons of methanol between the load port of Marsa al Brega Libya to the discharge port of Marmara, Turkey. The agreed laydays for loading the cargo was 10-15.8. 2006. However, the Owners kept on postponing the loading of the cargo, arguing that they should be exempt from the damages caused due to the postponement because during that time the vessel was located at the east of the Mediterranean Sea and was subject to the military activities which took place during that period, between the State of Israel and the Hizballah located in Lebanon.
This argument was rejected by the Court, which held, that, the above military activities had begun on 12.7.2016 and was perfectly known to Owners on the date of the fixture (26.7.2016). Therefore, under such circumstances, if the Owners wished to determine in the agreement that these events should be considered as a risk which should exempt the Owners form its liabilities, it should have been drafted in specific wording in the charter party agreement, and the general exemption of "all going well, weather and safe navigation permitting" cannot be considered as covering known military activities. Especially, when considering the importance of the time schedule for the arrival, loading and discharge of the vessel under a voyage charter party. Therefore, the Owners were found liable by the Court for the damages which were caused due to its delay in loading the cargo.
During the recent "Guardian of the Walls", conflict between Hamas and Israel, Hamas launched 4,360 missiles and mortar bombs towards the state of Israel. 680 of these, fell in the Gaza strip itself, 1,843 fell in non-populated open areas in Israel and out of a total 1,837 missiles and bombs aimed at populated areas in Israel, 1,661 were intercepted by the "Iron Doom", and 176 were not intercepted and fell in populated areas. During this period, as mentioned above, Haifa and Eilat were not alerted even not once, and the port of Ashdod listed, in its daily working plan for the 19th May, 19 vessels which were under loading or discharging operations at the piers, 32 vessels located at the piers themselves, and abut 50 vessels which were waiting on anchor, out-side the port. 17 of these were bulk carriers which arrived at Ashdod Port during 12-18 May 2021.
Whether or not for a vessel to call at an Israeli port during the period 10th -21 May 2021 could be considered as putting the vessel in danger according to a "war clause" either in a charter party or an insurance policy, will be determined by the location of the port itself, the manner in which the charterparty was concluded and the specific circumstances which would lead to the conclusion if a reasonable business man would consider the port as dangerous at that time. However, is seems that although being under continuous rounds of hostility and escalations with the Hamas controlling the Gaza Strip, still, considering the authorities, there can be no categorical determination if Israeli ports are or were "dangerous" due to "acts of war". This aspect, which seems to follow the shipping industry, will continue to be examined.
 Ewan Mckendrick, "Force Majeure and Frustration of Contracts", first published 1991, page 133.
 Pages 135-136
 Spinney's (1948) Ltd, Spinney's Centers SAL and Michael Doumet, Joseph Doumet and Distributors and Agencies SAL v. Royal Insurance Co. Ltd  1 Lloyd's Rep. 406.
 John Dunt, "Marine Cargo Insurance", Informa, 2009, page 192.
M.T Wilford and T.G. Coghlin, "TIME CHARTERS", Fifth Edition, 2003 Paragraph 24.38, page 402.