The main reason why Beowulf's men were unable to help him is that they were afraid and they couldn't go underwater to fight the monster.
Who is Beowulf?
He is a fictional character whose exploits are told in the epic poem Beowulf as he comes to the aid of a friendly kingdom to defeat Grendel, the monster.
Hence, we can see that when he goes to fight Grendel, his men were scared and stayed outside while he battled inside, before defeating and killing Grendel.
Read more about Beowulf here:
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