LOW WIRE ENTANGLEMENTS. Stout sticks, 36 inches long and 1½ to 2 inches in diameter, are driven into the ground on level at 6-foot intervals. These should be driven in at least three rows so arranged that the sticks in one row are opposite the centers of gaps in the next. The heads of the sticks are connected by strong wires crossing diagonally from 12 to 18 inches above the ground. HIGH WIRE ENTANGLEMENTS. To be effective, high wire entanglements should prevent the enemy from crawling through it at or near the ground level, and when possible, should be screened from enemy artillery observation. This obviously is utterly impossible as far as wire entanglements in front of the firing line is concerned, but it is possible to a certain extent to screen these high entanglements from observation in front of support lines and second line systems. Under conditions existing at the front, the wire work is often and generally, for very good reasons, of a hasty character, and it is best, therefore, to limit the first stage to just enough to form a nucleus of the whole entanglement, in order that the required area may be covered by obstacle before serious interruption occurs. To do this, the obstacle is best constructed in two zones, with a small space between. The pickets should be from 5 to 8 feet long and average five inches in diameter, being placed at irregular distances and with varying heights in order to make more difficult the passage over them by means of hurdles and planks. The outer pickets should be very firmly driven and stayed to prevent the enemy dragging the obstacle away. It is also nice to drive large nails into the tops of the posts with half their length projecting. After the posts are driven in, they are first joined diagonally, that is, from head to foot and foot to head, by winding the wire around each post and securing it by staples. Each set of posts should be stayed by four wires. There should be a trip wire 9 inches from the ground, or even less, running continuously round the outer posts, and another one foot from the top of the middle posts. The barbed wire can then be hung in festoons between the posts on no fixed pattern and fastened to them. It must also be fastened to the other wire where it crosses, by short lengths of wire especially cut beforehand. Slack wires are of more hindrance when cut than taut wires. Tight wires help the enemy’s advance by giving support to hurdles and other methods used to get across these entanglements. One method once used by the Germans was the carrying out of mattresses and endeavoring to cover the wire obstacles in that manner, and had the wire been taut it would have been a success, but as it happened, it was not.