What little war that the US was involved in do you like to know all about and why?

In every historical thread we see posts about the Civil War, WW1 and 2, Vietnam, the Gulf War, etc. How about the lesser talked about wars; the little ones? Let me set up some ground rules...

The war is seldom talked about anywhere. Like the Black Hawk War, or perhaps the War with Mexico (no not Texas fighting Mexico).
The war is small. Meaning that the number of troops involved were smaller than wars such as the Civil War or more modern wars. It can be a situation that we had a tiny army and it was fully committed. Or that only one military branch actually fought.
The war really only had one, perhaps two theaters.
Post colonial history, but after we declared our independence.
The US has to be involved.
They are actual wars, not military actions.

I would like to omit the Korean War even though it is not talked about that much, bit that it was a large scale war for us. Also, I would like to omit the War of 1812 as I feel it is talked about "just enough" and that there were multiple theaters of the war to make it a larger war.

No flame wars, no need for trolls, and keep it classy!

The Korean War fascinates me, because it’s simultaneously this war of brilliant tactical and strategic maneuver, when U.S. Army minds were perfectly in sync with the technology and terrain. But it was also one of the most desperate, bloody, terrible struggles in American history. Reading about Busan, Chosin, Inchon, the Second Battle of Seoul, or Pork Chop Hill is a downright inspiring process because of the lengths these men went through.

One of my favorites in this area is the Pig War.

This was between the US and UK in 1859, when the border between the Oregon Territory and Canada was still in question. Some of the islands were claimed by both sides, and had settlers from both sides living on them.

On 15 June 1859, a US farmer on San Juan Island found a pig eating vegitables in his garden, so shot it. The problem was that the pig beloned to a nearby Irishman.

Words were exchanged between the 2 men, and eventually the Irish farmer tried to call in the British authorities to have the American arrested. In response the American farmer called to help from the US. 66 soldiers were dispatched, in order to prevent the British from landing and taking the American into custody. The British responded by sending in 3 warships. The US responded by bringing in artillery to a camp on the South side of the island. The British Royal Marines set up an encampment on the North side of the island.

Things moved along this way, until Mid August, when James Douglas, the British Governor of Vancouver ordered Admiral Baynes to land an overwhelming force of Royal Marines on the island and to kill or drive off all of the Americans on the island. Thankfully, Admiral Baynes refused, stating that 2 great nations going to war over a pig was foolish.

Thankfully at about this time Washington and London both got involved and General Winfield Scott was dispatched to help reach a settlement. It was decided that both sides would be allowed to keep no more than 100 men on the island, until a permanent solution could be reached. Finally in 1872 the island was deeded to the US, and the British peacefully left the island.

And to this day, at the National Historical Park on the location of the British Camp, US Park Service personnel still raise and lower the British flag every day.