Русский корпус
The 2nd Army was to continue its advance south of the 1st Army and German 8th Army before swinging north towards its objective of Seeburg, but with little to no effective communication there was little coordination between the two armies. While sluggish due to supply shortages, poor logistics, and misuse of railway lines, the 2nd Army's advance was relatively unopposed until 22 August when it encountered German forces all along its front. A number of successful thrusts were conducted, pushing the Germans back. On 23 August they succeeded in driving the German XX Corps back to a defensive line. A second push against the XX Corps on the 24th failed but the Germans withdrew to avoid being cut off. Samsonov saw this as a perfect opportunity to pursue and cut the XX Corps off and so began moving the 2nd Army in a northwesterly direction, changing his direction of attack and not informing Rennenkampf in the process. Seeing this opportunity and feeling safe on his flanks, he transferred the bulk of his force to the northwest, leaving a single corps, VI Russian Corps, to simultaneously hold the right flank and swing north to the objective of Seeburg and a single corps, I Russian Corps, to hold the left flank.