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I -The ancient Spartans tested the endurance of potential warriors devising various ordels, including one that '' ''
II-The ancient Spartans tested the endurance of potential warriors by devising various ordels, including one that ''''
Is it truly necessary to use the preposition ''by'' before the noun ''warrior''?
No, but if you don't use 'by', you must have a comma between 'warriors' and 'devising' in the first sentence..
It is essential to spell 'ordeals' correctly.
It is also important to give your title a thread that gives us an idea of what to expect. 'Do we need 'by' before 'devising'' would have been better.