On this day the cavalry under Gen. Allenby reached the neighborhood of
Braine and did good work in clearing the town and the high ground beyond
it of strong hostile detachments. The Queen's Bays are particularly
mentioned by the General as having assisted greatly in the success of
this operation. They were well supported by the Third Division, which on
this night bivouacked at Brenelle, south of the river.

The Fifth Division approached Missy, but were unable to make headway.

The First Army Corps reached the neighborhood of Vauxcéré without much
opposition.

In this manner the battle of the Aisne commenced.

2. The Aisne Valley runs generally east and west, and consists of a
flat-bottomed depression of width varying from half a mile to two miles,
down which the river follows a winding course to the west, at some
points near the southern slopes of the valley and at others near the
northern. The high ground both on the north and south of the river is
approximately 400 feet above the bottom of the valley, and is very
similar in character, as are both slopes of the valley itself, which are
broken into numerous rounded spurs and re-entrants. The most prominent
of the former are the Chivre spur on the right bank and Sermoise spur on
the left. Near the latter place the general plateau, on the south is
divided by a subsidiary valley of much the same character, down which
the small River Vesle flows to the main stream near Sermoise. The slopes
of the plateau overlooking the Aisne on the north and south are of
varying steepness, and are covered with numerous patches of wood, which
also stretch upward and backward over the edge on to the top of the high
ground. There are several villages and small towns dotted about in the