
I doubt people will like doing your homework for you either.
But this is essentially the answer.
wrong kind of tank
Before the tanks arrived there was a stalemate in the warfare. Both sides had dug themselves trenches which put them in strong defensive positions. Thus when the british invented the tank, they were able to break through the lines of the enemy and their trenches became useless in the face of the tanks (the heavy barbwire was easily overcome with the might of the tanks). Once the tanks had broken through the defences to caused panic and mayhem in the enemy lines it became easy for the infantry to move in.
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