Strategies--- the way battle was done back then does not apply to todays wars. Tho the weapons have changed. Back in early karate days guns were not used, there was a code of the warrior- the code now is do unto others before they do unto you. And rule? what rules?
The basic man of war hasn't changed much structurally , but mentally and physically - yes. Without change we would be stuck repeating mistakes- formulas once developed for battle still apply, but in different FORMULA STRUCTURE. Standing out in the open waiting for your opponent to advance and face you is not a good idea when a sniper can pick you off easily at 100 yards. More stealth like strategies are now used. Being sneaky is a good trait not a bad one for the man of honor used to face his opponent. This is a simple comparison and it is not complete, but it does apply.
You realise that in many ways, your wrong. Allow me to explain.
The way battle was fought "back then" does still apply. In the mid satges of WWI a British General reffernced a biblical battle for a stratigy. Modern generals study such battles as Carantan and The Buldge (WWII), several out of the Spanish-American, Mexican-American, the Civil War, and the Revolution. Names elude me, and I appoligise. Thermopolea (think the movie 300), Agicourt (100 years war), many of william wallaces battles out of his campaigns in the 1400's, and so on.
Their have never been rules, and no real code. Guys wouldn't kill each other, not because of some code, but because it would make his family mad. And it's easier to let a guy live, then fight his whole family. Or am I misunderstanding what you mean by a rule and code?
During the invasion of Iraq in the First Persian Gulf an enitre battalion of combined infantry/artillery was told "stand their, and look like a target". Because of what you said about, standing their is no-no. A brigade of Imperial guards (Iraqs best and brightest) marched up, and next thing they new they were surronded. Standing their can be the right thing to do. Ohh, and that tactic was from the campaiqns of Hannibal.
By the by, snipers as a distinct group have been around since
BEFORE the American civil war. We're talking the campaigns of Julius Cesear. And they were used heavily by the Yankees in the Revolution, and both sides during the Civil War. The Brit's got the idea, and so did the Dutch settlers in South Africa. So, during the Dutch Cvil War the Bohrs (what the Dutch settlers called themselves) used sniper tactics. Based off that whole Yank line of "don't shot till you see the whites of their eyes".
And sneaky tactics have always been used. It's just a matter of whether or not it's fesiable. During the American Revolution a large number of British troops were simply obliterated by a small number of Americans who the tactics of the group now know as the Rangers. Snipe a few officers, and vanish into the woods. Pop up latter, and do it again. Evetually, the British lost so many troops, they stopped caring. Something a Russian Cossaks used against Naploen at about the same time. It's just a matter of what is best over all.
Though, you are right in some ways. The people you fight have better tactics and weapons, so you get a better weapon. But with martial arts, the analogy is not quite the same. Your opponent gets better techniques and new weapons, you just figure out how to take what you already know and apply it to the new situation. Something generals have been doing since before recorded time. You have your oppion, and I have mine. But if your going into an argument with evidence that is either wrong, or simply doesn't apply, expect to have someone take issue with it.