The map of army deployments on the Long Long Trail Battle of Mons page:
Shows from west to east IV Division, III Division then II Division. Am I right in assuming that I Dvision were to the SE of II Division and therefore not directly involved in the battle? I am particularly interested in 2nd Brigade.
If you're talking specifically about the Battle of Mons on 23 Aug 1914, then 2/KRRC (2 Bde, 1st Div) were not directly in action. From their Battalion War Record in the 1914 KRRC Chronicle, it seems this was also true for the whole division.
On the night of 22/23 Aug they moved from ST REMY-MAL-BATI (17:30hrs) through MAUBEUGE to VILLER-SIRE-NICOLE (22:30hrs) where they had a short rest.
At 04:10hrs they set off again to a position just to the SW of ROUVEROY.