bc the hoplites fought holding their shield with their left arm and their spear with their right , the battleline's right flank was considered exposed and thus "weaker"... bc it presented a shieldless undefended far edge ... right flank=hoplite battleline's weakest point...
to make up for this "right-wing weakness" commanders would deploy their better trained,armoured hoplite contigents on the right , thus reducing the risk of the right flank collapsing (=major screwup)... for example when fighting along with their allies , the Spartans would typicaly assume the right ...
however BOTH battlelines would typicaly have their elites deployed on their respective right flanks... in battle after the initial stages and when OTHISMOS(=the push effect) kicked in it was very common for the rightflanker "badasses" to respectively push the less reliable hoplites standing on the enemy battleline's left (confused yet???better check the below sketch)
so the clashing hoplite battlelines would start to "rotate" around their centres... in an "anti-clockwise" movement (as shown in phase III of the scheme)...how long could this rotation last was a question of both leftflankers' ability to maintain their cohesion against the elites...
if the left-flankers broke they would be hunted down for a while and then the pursuing elites would turn and manouveur themselves against the enemy centre eventualy ripping the enemy battleline apart...
it was also very typical for hoplitebattles for both rightflankers (say Atheneans and Spartans) to push through against the enemy left... the battle then became a question of who would rip through the enemy battleline first...
Epaminondas simply capitulated on the "rotation" angle... he must have realised that the battleline's ability to absorb "othismos" pressure and rotate (instead of breaking) was limited ... that is the underlying principle of Epaminonda's "oblique formation"![]()
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