In 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?

He had not been entirely clearheaded when the chateau gates snapped shut behind him.

He saw that straight flight was futile; inevitably it would bring him face to face with the sea.

Rainsford had dug himself in in France when a second's delay meant death.

The pit grew deeper; when it was above his shoulders, he climbed out and from some hard saplings cut stakes and sharpened them to a fine point.

Then, wet with sweat and aching with tiredness, he crouched behind the stump of a lightning-charred tree.