July 29

Only July 29th, 1899, the first Hague Convention was signed.

The Hague Conventions were, along with the Geneva Conventions, an attempt to make warfare more "civilized". The first Hague Convention banned bombings via balloons, hollow point bullets, and chemical warfare. The second Hague Convention followed up in 1907, with more agreements on how warfare was to be committed, especially at sea.

The Geneva Protocol also followed up the Hague Convention, banning in more detail chemical warfare.

Despite the names, these are treaties, and the United States is a signatory.