a small explosive bomb thrown by hand or fired from a missile
"The soldier quickly threw a grenade into the trench to clear out the enemy positions before they could regroup."
A small explosive device, designed to be thrown by hand or launched from a grenade launcher.
"The soldier carefully checked his equipment before tossing the grenade into the enemy trench."
To use grenade(s) upon.
"The soldiers advanced carefully until they were close enough to throw their grenades at the enemy trench."