Branches were promoted (a) from Mukden to Antung on the Yalu, to connect with the Korean system, and (b) from Kwang-cheng-tsze to Kirin.
Thus, whilst the detachment was still disposed as a series of rearguards, the foremost fractions of it stood to fight on the Yalu, against odds of four to one.
For several miles above Antung the rivers Yalu and Aiho are 1 Not, as is often assumed, the fortress itself.
The first task of the right division (12th) was to cross the upper Yalu and seize this.
The Yalu, like Valmy, was a moment in the world's history.
Forward and back) was carried out in entire ignorance of the battle of the Yalu, and on arriving at Anju Madritov found nothing to attack, the 1st Army having after its victory adopted a short line of communication from a sea base near the Yalu mouth.
The Russians, then, at the beginning of June, were divided into three groups, the Southern, or offensive group (3 5,000), in the triangle Neuchwang-Haicheng-Kaiping; the Eastern or defensive group (30,000), the main body of it guarding the passes right and left of the Wiju-Liao-Yang road, the left (Cossacks) in the roadless hills of the upper Aiho and Yalu valleys, the right (Mishchenko's Cossacks and infantry supports) guarding Fenshuiling pass and the road from Takushan; the reserve (42,000) with Kuropatkin at Liao-Yang; the " Ussuri Army " about Vladivostok; and Stessel's two divisions in the Kwantung peninsula.
On the other hand, Nogi's 3rd Army, released by the fall of Port Arthur, was brought up on the Japanese left, and a new army under Kawamura (5th), formed of one of the Port Arthur and two reserve divisions, was working from the upper Yalu through the mountains towards the Russian left rear.
The Yalu rises in the mountains to the south of the plain, and empties into the Yellow Sea.
Its northern boundary is marked by the Tumen and Yalu rivers; the eastern boundary by the Sea of Japan; the southern boundary by Korea Strait; and the western boundary by the Yalu and the Yellow Sea.
In the north there are mountain groups with definite centres, the most notable being Paik-tu San or Pei-shan (8700 ft.) which contains the sources of the Yalu and Tumen.
In the 11th century Korea was stripped of her territory west of the Yalu by a warlike horde of Tungus stock, since which time her frontiers have been stationary.