Crossing the road one at a time, with utmost stealth, they reached the other side without having been challenged.
A little further on they espied a German sentry, pacing post.
Waiting until the fellow had gone to the furthest limit of his post, the chums, flat on their stomachs, crawled forward until, on looking backward, they judged it safe to rise and move on crouchingly.
Then they came in sight of the aviation station.
"Better crawl all the way now," Dick whispered.

"We have reached the point where any attempt at speed will be sure to place a few bullets in our bodies." Tom nodded, without speaking.

It was trampled, withered grass through which they now crawled.

It offered fair concealment, but there was danger of making a noise that might betray them to a keen-eared sentry.
At last, near the first hangar, they reached a spot where two trees stood close together.

Crawling to this shelter, they still remained lying down, though the tree trunks gave them greater safety against being seen.
In front of the hangars paced a sentry; at the rear another soldier walked post.