With no explanation, label text_A→text_B with either "not-entailed" or "entailed".
text_A: When the Americans swept in with their Search and Destroy operations the Communists quickly leaned they could not stand up to the US firepower , and these regular troops were forced to flee the country and take sanctuary across the borders in Laos and Cambodia .
text_B: The fleeing did not happen
not-entailed.