There isn't that much canon out there on this. G O'F's summary is more or less it, as far as I can see.
Andrew, Sigg, we really do need to incorporate some of this into Spica, but it does deserve it's own supplement.
Kafka's idea is nice for an adventure series: makes a change being refugees rather than the
nasty men with guns creating them.
Most of us seem to be armchair historians of one sort or another, and there's alot of our own dubious history we can use for inspiration.
Revolutionary wars: War of Independence, French Revolutionary wars, Russian civil war, Spanish civil war. - Solomani grievances would run the whole gamut of political stripes. IMHO they're not all proto-Nazis; some might have honourable objectives akin to Jeffersonian democracy.
Meat-grinders: lots of these - the Somme, Verdun, Borodino, Stalingrad, Berlin, Okinawa, et al.
Desperate defences: Stalingrad, Battle of Britain, Korea, etc
Amphibious/aerial assaults: Gallipoli, Operation Torch, Anzio, Normandy, Crete, Arnhem, Iwo Jima,
Guerilla campaigns: Boer War, the Maqui, Russian partizans, Chindits, Borneo, Afghanistan, Vietnam etc.
Fleet actions: actually we don't have much here, as the world's navies seem to have been loath to commit to battle.
Battle of the Nile, Trafalgar, Battle of Tsushima, Falklands, Jutland, North Cape, Midway, plus running down commerce raiders, River Plate, Bismark, or shoring up defenses/retreats, Guadalacanal, Dunkirk.
If we look beyond the military details, and take into account the political ramifications, we could probably cobble together a rough account just using real world examples, then have fun embellishing it with sci-fi goodness.