"This includes, for example, a three-gun battery firing two of its guns with five-second intervals between rounds and one gun remaining at the ready in case of a misfire; such a battery would be used at an Armed Forces Full Honors Funeral, or for State Arrival Ceremony of a foreign dignitary at the Tomb of the Unknowns in Arlington National Cemetery. A four-gun battery has its first three guns firing rounds at three-second intervals, with the fourth gun (again) at the ready in case of misfire."
But it doesn't say the purpose of a four-gun battery is different from the purpose of a three-gun battery. And also, this is Wikipedia without appropriate citations, not a reliable source of information at all!!
The paragraph says:
"This includes, for example, a three-gun battery firing two of its guns with five-second intervals between rounds and one gun remaining at the ready in case of a misfire; such a battery would be used at an Armed Forces Full Honors Funeral, or for State Arrival Ceremony of a foreign dignitary at the Tomb of the Unknowns in Arlington National Cemetery. A four-gun battery has its first three guns firing rounds at three-second intervals, with the fourth gun (again) at the ready in case of misfire."
But it doesn't say the purpose of a four-gun battery is different from the purpose of a three-gun battery. And also, this is Wikipedia without appropriate citations, not a reliable source of information at all!!