Some of these pictures and descriptions may give away plot details that you might not want to know before watching the film.
This is a WWII movie based on the Norman Mailer novel about American soldiers on a Pacific Island fighting the Japanese. In the snake scene, a platoon of soldiers on a reconnaissance patrol behind enemy lines are sitting down in a rocky area next to a river. One soldier complains: "This stinkin' hole has got everything - chiggers, mosquitoes, tarantulas, you name it." When you hear talk like that in a movie, you know that something nasty is about to show up. Cue the snake. We see a thin green snake crawling around some rocks then a soldier screams "Something bit me! My leg!" and we see him start to roll around screaming. One soldier pulls up his pant leg and cuts the bite then sucks and spits out blood. But then we see foam coming out of the snake-bitten soldier's mouth and he's dead in only a couple of minutes. (I'm no expert on venomous snakes, but I'm fairly certain that no snake venom can kill that quickly.) Then another soldier screams "I got 'em!" and we see him holding up the snake in one hand, then he hacks it in half with his machete. (This has to be the absolute worst thing you can do with a venomous snake whose bite kills in minutes - risk another bite by picking it up with your bare hands.) After they bury the dead soldier, him another soldier says sarcastically "Private Wyman - killed in action - by a snake."