I think Rokossovsky doesn't get a lot of attention - imprisoned and tortured by the NKVD because of association with Tukhachevsky and other disliked commanders in the Red Army, he refused to confess and eventually proved his innocence and was imprisoned for a long time before being rejoining the Red Army at a lower rank. He was instrumental in the defense of Moscow and Operation Bagration, where he supposedly insisted, against Stalin's wishes, that there be two pincer attacks instead of one, and at the final insistence, Stalin put his hand on Rokossovsky's shoulder, as if to rip off his epaulets, before saying that Rokossovsky's dedication convinced him. Arguably a better military commander than Zhukov, at least early in the war. Later on, he (as he was Polish) became the marshal of the Polish Red Army, and was one of the staunchest Stalinists in Poland, and was eventually ousted and returned to Russia.