Alan Ladd plays Cash Adams, an ex-West Point officer who was dishonorably discharged from the military. Now he's a gun runner selling weapons to the highest bidder. He arrives in Tampa to sell guns to Cubans, who are fighting Spanish oppressors. Right away he's thrown a curve when he is told he must deliver the weapons to Cuba before he is paid. It is a switch of plans but he agrees but for double the original price. He delivers the cargo to large paddle boat operated by Captain Jones (Chill Wills). There, he is surprise to see Clay Pike (Lloyd Nolan), an old nemesis who is also selling weapons to Cuba.
Adams tells anyone who will listen that he is only interested in money. The viewer suspects that Adams doesn't quite believe that himself. On the boat, we meet Dona Isabella (Rossana Podesta), a Cuban patriot, who has been collecting funds in America. It becomes apparent that the rivalry Pike and Adams runs very deep and the two men seem to hate each other.
The boat arrives in Cuba, but there is another change of plan. The Spanish now control the roads. So the weapons will have to be transported through the heavy bush and jungle.There are a couple of close shaves but the group eventually manage to deliver the weapons to the specified destination. Adams learns that the Cubans were attacked by the Spanish and have gone into hiding. Pike has had too many changes to the plan and too many scrapes with death. He decides right then and there that they will forget the delivery and sell the weapons to the Spanish. Adams disagrees with his proposal.
Now the long running battle between the two men will come to a close. The fight to the death that both men had envisioned is about to take place. If Pike wins, the weapons will be sold to the Spanish. If Adams wins, they continue on in their journey to deliver the weapons. It's a solid little adventure film. The two leads, Nolan and Ladd, run the show and deliver as one would expect. Some reviewers really seem to dislike the film. It's no masterpiece, but a typical 50's adventure film, aimed at the youngsters.