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Fighting as heavy cavalry,i.e. operating in close formation, the Thessalians mayhave been armed in a similar fashion as the Companions (Hammond 1989, 106).Thessalian aristocrats may even have influenced their Macedonian fellow noblesin this respect in the course of the fourth century. Relatively heavy armament inany case will have been necessary to bear up against heavily-armed Iranian caval-ry. This means that the Thessalians may have worn linen cuirasses, helmets, pteruges and greaves. Bronze armor and shields will have been exceptional24. The rhomboid formation, if historical, suggests that they were armed with a long cav-alry lance, probably supplemented by a cavalry saber (kopis). In combination with a lance the use of a shield is not likely. The use of horse armor seems unlikely too25
I found this: https://www.reddit.com/r/AskHistorians/comments/4ktsij/why_were_cavalry_forces_seemingly_always_so_small/?utm_source=reddit&utm_medium=usertext&utm_name=AskHistorians&utm_content=t1_e75sihzThe poster Iphikrates is Dr Konijnendijk, author of the above book, and it's mainly his posts I was looking at. The thread is mostly about cavalry in general but has numbers of 20,000 hoplites and 8,000 cavalry, and 10,000 hoplites and 6,000 cavalry as potential levy sizes for the Thessalians.