Excerpts from Books and Wikipedia
"Japanese victory, although at high cost, brought about talks that ended the Russo-Japanese War and established Japan as an internationally recognized military power." [Davis: 100 Decisive Battles, p. 343]
"The Battle of Mukden, one of the largest land battles to be fought before World War I and the last and the most decisive major land battle of the Russo-Japanese War, was fought from 20 February to 10 March 1905 between Japan and Russia near Mukden in Manchuria. The city is now called Shenyang, the capital of Liaoning province in China.
The Russian forces, numbering more than 276,000, under General Alexei Nikolajevich Kuropatkin, fought the attacking Imperial Japanese Army forces numbering more than 270,000, led by Marshal Marquess Ōyama Iwao. Involving 546,000 combat participants and 164,000 combatant casualties, it was the largest modern-era battle fought prior to World War I, and possibly the largest battle in world history up to that point." [Wikipedia]