Your rifle company is well-equipped for assaulting and crushing the enemy. Prepare your assault with your Mark IV tanks. They will pulverize Jerry's gun nests with high-explosives and rake his trenches with machinegun fire. Then send in your highly-trained rifle platoons to clear out the trenches and breakthrough.
With a gap opened up, send in the fast Whippet tank to machinegun and run down the enemy on the run. No doubt the enemy will try and counterattack, so have your machineguns set up to cut down their infantry, and carefully sight your 18 pdr artillery guns to knock out German A7V tanks.