One of the basic military tenants is to fight where you are strong and the enemy is weak. It may be good at times to split your forces, but not if it means that the enemy can send his entire force(a strong position) against part of your force(a weak position). Being caught seperated was definately not good for the elves.
Morgoth was unbeatable for more reasons than just the size/strengh of his armies. His ability to incite treason and betrayal was another reason why the war was ultimately hopeless.
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