WWI, at least in Europe, did not produce much in the way of successful generals. The elderly French generals tried to avoid a repeat of 1870 and the Germans tried for a repeat of 1870. The elderly British generals brought their experience from the Zulu and the Boer wars. Once the armies met, they dug in and that was it.

Pershing's contribution was not generalship, but enough fresh soldiers to tip the balance.

Maybe Allenby and Lawrence in the middle east?