Several instances are on record where infantry regiments, with no other tools than this, covered themselves on the field with quite respectable rifle pits.
The starting point of a tunnel was always some tent close to the Dead Line, and sufficiently well closed to screen the operations from the sight of the guards near by.

The party engaged in the work organized by giving every man a number to secure the proper apportionment of the labor.

Number One began digging with his half canteen.

After he had worked until tired, he came out, and Number Two took his place, and so on.

The tunnel was simply a round, rat-like burrow, a little larger than a man's body.