Traverse

[rich]

part of a WWI trench is called a traverse:

*Traverse *: Trenches were not straight ditches, since this would have made
them far too vulnerable to enfilade fire. Instead, they had traverses built
in. These were protrusions of earth or sandbags into the trench, giving a
crenelated appearance when viewed from the
air<http://www.kirkusreviews.com/kirkusreviews/reports_analysis/?s=air>.
They also reduced the effect of shells when they landed in the trench.
interesting...

rich
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