@Setanta,
I was thinking of The Pig War. A confrontation in 1859 in the San Juan Islands between the United States and the British Empire over the boundary between the US and British North America.
It seemed a large black pig escaped and ate the neighbor’s spuds. It wasn't the first time and the pig was dispatched. The problem was that the pig had crossed the border between the US and Canada established by the 1846 Treaty of Oregon.
The war consisted of two military attachments standing chest to chest with feathers ruffled. The only casualty was the pig and it was delicious.
Rap