Richard connell's short story "the most dangerous game," the main character, sanger rainsford, is a former war hero. which sentence from this excerpt hints at his time serving in the war?

Had to look for the missing details and here is my answer.
"The Most Dangerous Game" is actually a short story written by Richard Connell and Sanger Rainsford is the protagonist in the story. Based on the excerpt attached, the sentence that hints his time serving in the war is this: "Rainsford had dug himself in in France when a second's delay meant death." Hope this helps.