The following day, 26 September, as the 321st launched its
three-pronged attack against Hill 100/Hill B (northern cap of the
Umurbrogol Pocket) and the 5th Marines attacked four hills running
east to west across Peleliu, dubbed Hills 1, 2, 3, and Radar Hill in
Hill Row. The row was perpendicular to and south of the last northern
ridge, Amiangal Mountain. These hills and the ridge were defended by
some 1,500 infantry, artillerymen, naval engineers, and the shot-up
reinforcing infantry battalion which landed the night of 23 September,
in caves and interconnected tunnels within the ridge and the hills. As
the fight for Hill Row developed, Colonel Harris had his 2d Battalion
side-step west of Hill Row and begin an attack on the Amiangal ridge to
the north. Before dark, the 2d Battalion had taken the southern end
and crest of the ridge, but was under severe fire from cave positions
in the central and northwestern slopes of the ridge.
[Illustration: