Did mounted warfare exist before stirrups? The bronze age was all about chariots, and had little or no mounted combat. I'm not sure if that was because of a lac

Did mounted warfare exist before stirrups? The bronze age was all about chariots, and had little or no mounted combat. I'm not sure if that was because of a lack of stirrups or because horses simply hadn't been bred large enough. The big question is of course whether Alexander the Great's famous hetairoi used stirrups or not. According to [0] they're considered among the first shock cavalry, and yet I can't find anything about them using stirrups, so clearly mounted combat, including shock cavalry, must have been possible without them. [0] https://en.wikipedia.org/wiki/Companion_cavalry https://en.wikipedia.org/wiki/Companion_cavalry