At which 1917 battle were tanks used effectively in a large-scale attack?

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Grades 11 and 12 - World History - Senior High School - World War One: 1914-18 - Battles Of 1917 And 1918 On The Western Front — practice the complete quiz, review flashcards, or try a random question.

The United States came into the war in April 1917, but it took a while for their troops to be trained and transported across  the Atlantic.  Many bitter battles took place before American participation began to tip the balance.  
 


At which 1917 battle were tanks used effectively in a large-scale attack?