In what way did trench warfare turn out to be a disadvantage to both germany and the allies in the war? -trenches were too deep to allow troops to fire their weapons, so the troops were weak and vulnerable. -trenches were poorly dug and collapsed often, greatly slowing the troops’ movement. -troops from both sides often overran the same trench, leading to many deaths and injuries. -troops were basically trapped in their trenches, preventing progress toward seizing enemy territory.