What weapon helped lead to Trench Warfare?

History

  It was for protection from artillery, and advancements in weapon technology that caused ww1 to be fought in the trenches

Explanation:

As the war progressed, armies used a wider variety of weapons to better equip their troops for trench fighting and attacks across No Man's Land, including grenades, rifle grenades, mortars, and several types of machine-guns

Explanation:

d)to gain support for the independence movement.

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