Why Fight a War?
Countries and empires have often fought nice battles over the years for many reasons. Some were for worthy causes. Most of them were fought over petty nonsense. Some of these causes are explored here.
Land
Some leaders in history have the certain mentality that their country does not occupy enough space to make themselves comfortable. For example, Alexander the Great felt claustrophobic in his tincy-wincy Macedonian Empire which only covered about half of the known world at that time and so spent the rest of his sorry and sad life trying to conquer the rest.
Land is a very nice thing to fight over. Without it, you cannot build Disneyland, theme parks, game arcades, palaces, more disneylands, more theme parks, more game arcades, and more palaces. Oh, did I forget theme parks? Other than that, more land means more war, and more stuff to pass the time.
Personal Gains
All country leaders are evil and want only stuff for themselves! The greatest example in history is in the present! George Shrubbery invaded Iraq (pronounced i-RACK) for oil, the whole oil, and nothing but the oil, just because he was too cheap to go to the Esso gas station down the road to fill his Honda! See? We should burn the Bush! Down with Bonsai! Down with Topiary! Ni!
Personal gains have been part and parcel of the war, not just for the high ranking people, but also the infantry grunt. Marines were rushing onto the beaches and getting slaughtered by machine-guns because the Ford Motor Factory promised a free car to the first 100 marines to land on Tarawa. What losers.
Alcohol
Everybody who fights a war will get drunk at least 30 times. You see, a raving, drunkard group of Allied soldiers who don't know what's happening will be more likely to cross a field covered with mines, falling artillery shells, machine-gun posts, and intoxicated Germans than a sober, alert group of Allied soldiers. The same applies vice versa, but not for the Russians as they have the habit of making friends with the vodka bottle within 5 minutes for 5 years. Once, a Soviet artillery commander fired 120mm shells into a supply shed because the suppliers there wouldn't give him his vodka. Alcohol business becomes the most lucrative business during the war and the most influential one too.
Landmarks
Landmarks are special features in the world. They are sometimes causes for disputes, especially during early wars. The cavemen tribe Gruntsnorklegrunt decimated the enemy Gruntsnorklesnorkle tribe in the rather unimaginatively named Gruntsnorklegrunt - Gruntsnorklesnorkle conflict in the land of Snorklegruntsnorkle. They were warring over the Gruntgruntgrunt waterhole and a dead mammoth by the name of Snorklesnorklesnorkle.
Of course, the most famous battle over landmarks known to most Sec 1 RI boys is the second mission in the Hittite campaign in the Age of Empires trial, where you have to capture a miniature version of Stonehenge. You can actually win the mission with just the scout calvary, just rush it to the structure that looks like a pool surrounded by several pieces of black plasticine.