The foreign policy issue that was a motivation for American intervention in Vietnam was the idea of "containment" which sought to contain communist expansion where it was, as opposed to attempting to eradicate it at the source.
Answer:
A creeping bombardment, first employed at the Battle of the Somme, featured artillery fire going forward in stages only ahead of the advancing infantry. ... The plan demanded correct timing for both the heavy artillery and the infantry to function. Failure to do that would result in their own troops being killed by artillery.
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