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Considering Hiruzen & Danzo were on it the other's had to be quite skilled, especially Kagami Uchiha who is the father of Shisui Uchiha
He also trained a three-man team of his own, which consisted of Hiruzen Sarutobi, Homura Mitokado, and Koharu Utatane.[12] In the anime, another one of his students was Kosuke Maruboshi. On one mission during the First Shinobi World War, Team Tobirama alongside three of his other hand-picked elite ninja: Danzō Shimura, Kagami Uchiha, and Torifu Akimichi, found themselves surrounded by twenty elite Kumo ninja known as the Kinkaku Force. Tobirama then realised that the only way any of them could escape alive was for one of them to be a decoy and sacrifice themselves; therefore having faith that he had trained his students well, he chose to sacrifice himself after he selected his prized student Hiruzen for the position of Third Hokage. Homura and Koharu would later become Hiruzen's advisers. After giving the title of Hokage to Hiruzen, Tobirama went off to fight the enemies where he died a noble death.[13]