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v. Simple past tense and past participle of countermarch.

"Gunpowder complicated things further, so from the sixteenth century on, troops slapped wood and iron and marched and countermarched to the choreography of drillmasters."

countermarched    countermarches    countermarching   

reorder    process    march    marching   

countermarched    countermarching   

retrocession   

side-pee    thecar    checkerwise    ex-terrorist    unmasking