In May of 1919, Rüdiger von der Goltz, in command of the Iron Division, liberated the city of Riga from the Red Riflemen. In doing so, he was fulfilling his part of his bargain with the French and British governments, which allowed him to operate in the Baltic Region (and, indeed, provided support) as long as he fought against the Bolsheviks. In June of 1919, von der Goltz turned on the armies of the newly formed republics of Latvia and Estonia, which defeated him at the battle of Cesis. This led to the French and British governments to cease their support and require that the Iron Division return to Germany.
If, in June of 1919, von der Goltz had refrained from fighting the forces of the new Baltic republics, the anti-Bolshevik forces in the region would have been much stronger. At the very least, when Yudenich marched on Petrograd in the autumn of 1919, he would have done so with a force that was much larger than the one he led in our time line.