The phrase "accepting battle" is correct and usable in written English.
It can be used in contexts where someone is ready to engage in a conflict or challenge, often in a metaphorical or literal sense.
Example: "The knight, with his sword drawn, stood firm, accepting battle against the approaching enemy."
Alternatives: "embracing conflict" or "ready for combat".
Thereafter, the Russians interfered successfully with the Swedes' communications, and by the summer of 1709 Charles XII had no choice between accepting battle with the Russians or withdrawing once more into Poland.
Although Rupert had counselled the King against accepting battle at Naseby, the opinions of Digby had won the day in council: nonetheless, Rupert's defeat damaged him, rather than Digby, politically.
But the militant Kizilbash followers of the Ṣafavids forced the shah to accept battle by intercepting the Ottomans before they entered Azerbaijan.
It also modified accepted battle doctrine in several instances, particularly where destroyers and cruisers were used to support a general battleship engagement.
However, when Cimon continued to bear down on the Persians, they accepted battle.
There can be little doubt from Herodotus' account that Mardonius was prepared to accept battle on his own terms, however.
Diodorus tells us that once the Athenians had arrived, they and the Egyptians accepted battle from the Persians.
He placed the Gladiator below and in front of the Italian fighter to tempt the enemy pilot, but could not persuade it to accept battle.
After waiting in vain for the Muslims to accept battle, the strategos turned his army back, but was ambushed by the Muslims who put his men to flight.
To entice his enemy to accept battle, Li Shimin sent his cavalry to raid Dou's supply lines, and positioned his troops at Hulao so as to suggest that only a small force was present.
While police in Liverpool fought to keep rioters out of the city centre, in Birmingham officers accepted the battle was already lost.
