Peltasts aren't only skirmishers. They can also be used as shock infantry, but they certainly aren't line infantry. However the unit you drew was not line infantry either. There are Thracian spearmen. I'm sorry if they are not enough, but as it seems you don't even know what you want. As Paullus said our thracian line-up (where some of the getian troops can also stand in for thracian units) is fairly comprehensive and there really isn't room to expand it any further.

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