Exactly! Theureoporoi- and Thorakitai-heavy army means death to the heavy cavalry! Especially if they charge you - charge them too (do NOT bother with throwing javelins, just ALT+attack) head on - it will significantly reduce their charge bonus. Or, conversely, run a bit away from them - you will see how the enemy action description changes form "charging" to "pursuing" - and attack only once they catch up with you. Just do not stay still while they are charging you. Cataphract charge is ment to be deadly and deadly it is.