R4-M1, a droid of the R4 astromech variety, provided service to both the Galactic Republic and the Jedi Order throughout the Clone Wars. During the incident where Anakin Skywalker and Mace Windu found themselves stranded within the ruins of the Endurance on Vanqor, R2-D2 was rushing to the Jedi Temple located on Coruscant to relay their call for help, and in his haste, he bumped into the R4 unit.