The barrel of a shotgun poked out the driver's window and exploded.
The Union lit the barrels and most of the trench exploded.
The barrel exploded in a rush of flame and smoke, igniting two others close by.
Later estimates suggested that as many as 25 barrels of powder had exploded.
The smoke cleared and he saw that the barrels of fire-powder must have exploded.
There were reports that some barrels exploded on contact with water.
At one point a barrel of powder exploded which opened a gaping hole in the city's defenses.
Once the barrel has exploded, the galley can back off with little further danger from her victim.
The barrels explode, but the wall is too strong to be destroyed.
One barrel had rolled into a barber shop and exploded.