What was trench warfare?

Explanation:

Trench warfare is a type of fighting where a group of people (group 1 ) go and try to get to a trench which is a dugout where the enemy tries to shoot then so on group 2 and 3 etc until they have to run or take all the trenches and take control of their enemy.

Grenades were very effective

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freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.