推荐回答（5个）
为了戏剧性，小说和电视剧当然会这么编
三军易得，一将难求。谁会那么傻，总让自己的主将去比武，要是挂了，整个军队不就乱套了。（临阵换将，兵家大忌）
打仗比得是将领的指挥能力，以及军队的执行能力。将在智而不在勇，匹夫之勇是最为兵家所不耻的。项羽天生神力，不一样丢了天下？
所以万军从中斩上将首级，是很值得夸耀的事情，比如关羽斩颜良，就能封侯
《三国志·关羽传》：绍遣大将颜良攻东郡太守刘延於白马，曹公使张辽及羽为先锋击之。羽望见良麾盖，策马刺良于万众之中，斩其首还，绍诸将莫能当者，遂解白马围。曹公即表封羽为汉寿亭侯。
主帅关系着全军的士气，主帅稍有差池，则动摇军心。所以刘邦受箭伤，却坚持视察军队，并自称只伤到脚趾。
所以刺客在战争中时有出现，东汉名将岑彭、来歙都被刺客所杀
另外，单挑并不是不出现。主将对其武艺有信心者，也有单挑出阵激励士气的。不过这类记载很少
郭汜在城北。（吕）布开城门，将兵就汜，言“且却兵，但身决胜负”。汜、布乃独共对战，布以矛刺中汜，汜后骑遂前救汜，汜、布遂各两罢。
隋窦荣定击突厥，史万岁诣辕门，请自效。荣定素闻其名，见而大悦，因遣人谓突厥曰：“当各遣一壮士决胜负。”突厥许诺，因遣一骑挑战。荣定使万岁出应之。万岁驰，斩其首而还。突厥大惊，遂引军去。
太祖讨刘黑闼，尝于肥乡列阵，太宗亲率左右击之。有一突厥，勇壮绝人，直冲太宗。两将接，太宗以天策上将大箭射之，中心，洞背，应弦而毙，遂传此箭于北蕃。突厥见而惊叹。
将领与武艺也无必然联系，历史上的名将杜预、王镇恶、陈庆之等全都是不会骑马拉弓的，武圣姜子牙更是七八十岁的老头子形象
古时候不是这么打的，其实古人打仗更注重战阵，阵法之类的，落地站之后就是用阵法来战胜对手的，看的是将士的训练情况和将领的临场发挥情况。还有一种是用谋略，靠智慧来赢得赢得胜利。主将有时候会带领战士上前冲，那是一个勇将鼓励士气的方法，不是全靠单挑来结束战争的
春秋以前时代的战争是君子之战,两军堂堂正正对阵,冲杀一下就可以决定胜负,追敌不超过百步.
这是早期的战争形式，发展到后来这种“一骑打”就逐渐让位给集团作战了。只不过这种“一骑打”可以突出将领的神勇，读起来比较容易感觉紧张刺激，所以在小说等文学艺术作品中还是很常能见到。
之后和现代战争差不多一个理,都是探子先行.厉兵秣马,对着耗,一旦发现了战机及破绽,全部火力往上砸!这就是长平之战与东汉三大战役的典型特征.又或者说中国方式的战争.
兵马未动粮草先行，双方在保证后勤的基础上得花不少心思，后勤也是对方重点照顾的对象，大将一般是不单挑的，双方对数时候是对峙
不是。那是演义小说为了突出英雄人物的形象而改编的。古代作战讲的是战术也就是兵法。将领不一定见面才能开战
恩是的
因为古人讲诚信
现代人不讲了 所以小兵先上去当炮灰
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