The Navy vs. the Night Monsters

The Navy vs. the Night Monsters also known as Monsters of the Night and The Night Crawlers is a 1966 independently made American science fiction film produced by Jack Broder and Roger Corman, uncredited, written and directed by Michael A. Hoey, and starring Mamie Van Doren and Anthony Eisley Billy Gray, Bobby Van, and Pamela Mason. The film was distributed by Realart Pictures Inc.

It slowly becomes clear that the planted prehistoric trees have quickly grown into acidsecreting, carnivorous monsters that move about Gow Island at night, at will. They reproduce fast and eventually cut off the island with their growing numbers and nocturnal assaults on Gows native islanders. Brown has to hold together his dwindling Navy personnel and the coterie of scientists and civilians and figure out a way to stop this prehistoric menace. The Navy personnels only available weapons prove largely ineffective against the tree monsters.Eventually, the weather station is able to restore radio contact with the mainland and ask for help. In response, the military sends in multiple aircraft strikes from their nearest base. Fighter jets drop both napalm and fire airtoground missiles at the slowmoving night monsters, blowing then up or setting them ablaze. As a result, the prehistoric threat to Gow Islands surviving personnel is quickly eliminated. ........

Source: Wikipedia