Hera, Demeter, and Hestia are said to have fought alongside their brothers Zeus, Poseidon, and Hades in the war against the Titans.
To the modern imagination, it's easy to picture Demeter functioning like DC's Poison Ivy in a fight, commanding plants and vines against her enemies. Similarly, Hestia was a fire goddess, so her utility in combat isn't difficult to understand. Hera is a little more vague, being almost entirely domestic in her domain, though she prepares for battle alongside Athena in the Iliad before being stopped by Zeus, implying that she's decent with weapons.
But these are all deductions. Are there any explicit accounts of those three goddesses engaging in direct combat of any kind against mortals or supernatural beings, anywhere in Greek mythology?