Even if they did have another 7 or 8 thousand men, I doubt it would have done much at all in the battle of the Fall of Gondolin. Morgoth sent a huge force, which included dragons, balrogs and machines. An extra 8000 elves although perhaps delaying Morgoth's victory by a few hours, couldn't have stopped the city from falling.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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