Here are the cards for the 1908 World Champion Chicago Cubs pitching staff. Times were a bit different back then. These six players were on the mound for 1388 of the teams 1433 innings. That's 97% of the work among six guys! The team ERA was an unheard of 2.14. And they threw 108 complete games, too. I guess the team wasn't too concerned about pitch counts back then.
The ace of the staff was Hall of Famer Mordecai "Three Finger" Brown, who led the team with a 29-9 record and a minuscule 1.47 ERA.
Righty Ed Reulbach went 24-7 with a 2.03 ERA
Orval Overall, who had the best name on the staff, was 15-11 and had a great ERA, 1.92
Jack Pfiester was fourth on the staff in wins, posting a 12-10 record
Chick Fraser was the old man of the staff at age 34. His record was 11-9
The low man on the totem pole was Carl Lundgren, who had the only losing record among the six, going 6-9. His ERA was also a whopping 4.22. Today I would call him Aaron Heilman.