A not so short war; the Incan Empire (1766-1772)
Glasgow, December 1766
"Sire! Sire! I have great news!"
"Control yerself." The new king Charles III was not a man that suffered fools. "Now what is this news that is so great?"
"The Amazon colonies have been built, sire. The land invasion of the Inca Empire can begin when you give the word."
"Why invade from land when we easily could have attacked from the sea and more swiftly than a land invasion?"
"Er, um, I dunno, sire. Twas your fathers project."
"Well, my father was a fool then. Where are the Admiral of the Seas and the General of the Armies? I wish to have a 'talk' with them."
"Of course, sire."
"Begin the invasion of the Incas as well. We can always use more wealth."
"It will be done, sire."
Present day, Glasgow
"Not another boring Indian War." Shamus' boy did not sound pleased.
"Boring? Mayhaps, but there are valuable lessons to learn here."
"Like Scots have guns, the Incans don't and they lose bad?"
"Har boy, that is an accurate analysis by and large but the important idea was how the war was fought. Scotland, in many ways, was still a land power and not a naval one. Certainly, Scotland had a fleet, the world's largest in fact, but in matters of using that power, Scotland was rather backwards. The Incan War brought the problems of these old doctrines to the forefront.
The previous king planned on attacking the Incan Empire but needed to complete a way to get there, namely through the Amazon. Colonies were built along the generally unprofitable river basin. Wiser men would have pushed for more naval exploration and then armies could have been landed against the Inca all along the coast. Instead, this shortsighted plan of invading overland was adopted.
The result was the same, the Incas had no chance at all but this ended up being an extremely long war as armies had to both fight and explore, so long that political crisis developed and rebellion brewed in the African and Nova Scotian colonies."
"Ah, I understand! The war would be much shorter if the coasts were explored and troops were landed and marched inland, right?"
"Exactly right but not only that but if the seas had been explored this war could have taken place much sooner than 1766."
"That makes sense too."
"As it was, the Incans were annexed to the might of Scotland and Scotish attention was quickly devoted to a new problem, territorial disputes in Nova Scotia and America (that is S. America as the N. is Nova Scotia

) with the Spanish."
"Ooo, war with the so-called Spanish Empire!"
"Soon enough, lad, soon enough."