Final answer:
True, the battle between Beowulf and Grendel's mother is a solo fight, where Beowulf ultimately emerges victorious with the aid of a magical sword found in her lair.
Step-by-step explanation:
The fierce battle between Beowulf and Grendel's mother is indeed a one-on-one confrontation. In the epic poem, after Grendel is defeated by Beowulf, Grendel's mother seeks revenge for the death of her son. Beowulf then descends into her underwater lair to engage in a deadly fight. Despite the immense challenges Beowulf faces, including the ineffectiveness of his own sword against Grendel's mother, he ultimately finds a way to prevail. A magical sword found within the lair proves to be the decisive factor in the victory over this fearsome opponent.