It could be used in various ways, but always when there was no danger of enemy activity.

She did not attempt a landing due to enemy activity.

"Lieutenant Cantor, what do we know of enemy activity in the area?"

Have the watch officer record all enemy activity as he makes his rounds.

Inside South Vietnam, enemy activity was at a low during the year.

There is very little enemy activity this sector at the moment.

No other enemy activity detected in immediate area of ship.

The family water buffalo was another good indicator of enemy activity.

"There's been a noticeable increase in enemy activity since I arrived here several months ago," he said.

It is probable that he also monitored other intelligence and enemy activity.