.
crossing of, in presence of an enemy, [120].
order of battle at passage of, [192].
Rivers as eventual lines of defense,
.
as frontiers, [147].
as lines of operations, [76].
double passage of, [230].
.
crossing of, in presence of an enemy, [120].
order of battle at passage of, [192].
Rivers as eventual lines of defense,
.
as frontiers, [147].
as lines of operations, [76].
double passage of, [230].