"Collective punishment is the punishment of a group of people as a result of the behavior of one or more other individuals or groups. The punished group may often have no direct association with the other individuals or groups, or direct control over their actions.
"In times of war and armed conflict, collective punishment has resulted in atrocities, and is a violation of the laws of war and the Geneva Conventions.
"Historically, occupying powers have used collective punishment to retaliate against and deter attacks on their forces by resistance movements (e.g. destroying entire towns and villages where such attacks have occurred)."
Collective punishment - Wikipedia, the free encyclopedia
Art. 28. The presence of a protected person may not be used to render certain points or areas immune from military operations.
Art. 6. The present Convention shall apply from the outset of any conflict or occupation mentioned in Article 2.
In the territory of Parties to the conflict, the application of the present Convention shall cease on the general close of military operations.
In the case of occupied territory, the application of the present Convention shall cease one year after the general close of military operations; however, the Occupying Power shall be bound, for the duration of the occupation, to the extent that such Power exercises the functions of government in such territory, by the provisions of the following Articles of the present Convention: 1 to 12, 27, 29 to 34, 47, 49, 51, 52, 53, 59, 61 to 77, 143.
The Avalon Project : Convention (IV) Relative to the Protection of Civilian Persons in Time of War, August 12, 1949
Those warnings indicate that it is not collective punishment. Again. You don't have a case.