As a reservist recalled to active duty in 1950, I was assigned as an aerial gunner on a B-29 in the 372nd Bomb Squadron, 307th Bomb Wing, at Kadena Air Base in Okinawa, and flew combat missions over North Korea. By April 1951,it became apparent that Gen. Douglas MacArthur, supreme military commander in the Far East, fully intended to carry the offensive to Manchuria and the three B-29 groups in Japan and Okinawa would be designated to do so. By now, more than 500 MiG-15s were stationed at scattered airfields along the border in Manchuria.
We had already bombed the bridges over the Yalu River connecting Antung, Manchuria to Sinuiju, Korea, and had been attacked by MiG-15s, but the bridges had been partially repaired and troops and supplies continued to flow.
On the afternoon of April 11, 1951, a mission was posted for early the following morning, April 12, but no briefing on the target was scheduled, which was unusual.
I was designated to fly as tail gunner in the B-29 with Col. John M. Reynolds, commander of the 307 Wing, who would lead the mission. We assisted the ground crews to load our plane with 144 100-pound bombs, which were usually used against airfields. We were convinced something big was about to happen and that MacArthur might defy the president and send this mission to Manchuria.
That evening we were ordered to unload the 100-pound bombs and re-load with 40 500-pound bombs. It was apparent the target had been changed. Briefing was then called and it was announced that the target would be a return to the bridges at Sinuiju.
作者：冷哲
链接：https://www.zhihu.com/question/28770644/answer/42143723
来源：知乎
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这题本来是不想回答的。但是duang一下，有人在一个当时有点偏颇的答案（现在改得好了一些）下面@ 我，那我也只好说两句。
美军轰炸鸭绿江大桥的时候偶尔有几枚飘到中国境内，这确实是存在的。原理和缅甸空军误炸没有本质区别。但一般人们所讨论的，也就是志愿军入朝以前的这些美军攻击中国城镇的案例，恐怕无法归到“误炸”、“误射”之中。
首先呢，大家一般讨论的美军对丹东的轰炸，都是1950年10月以前美军的轰炸，这都是在“中国当年是否应该参与朝鲜战争”的问题中作为论据或反驳的。
这个答案为了说明存在误炸，举了个案例是参与1951年4月12日轰炸的一个美军士兵的日记。
1951年4月12日是个什么日子呢？
我们知道1950年10月19日，中国人民志愿军正式入朝。1950年底到1951年初，志愿军发动多次战役，把联合国军从中朝边境击退到了38线以南。然后杜鲁门在1951年4月11日将麦克阿瑟撤职。
在这个时间点上，中国军队已经深入朝鲜，两边打得不可开交，苏联空军也开始参加战斗。
那么1950年10月以前呢？有苏联空军拦截美军轰炸机吗？丹东有针对美军的防空阵地吗？为什么美军还是会轰炸到丹东呢？这能用“美军不得不在高空投弹”来解释吗？
美军对中国领土的第一次攻击发生在8月27日，据周恩来发给联合国的控诉电文称：“本日上午十时，有美国B-29机两架，飞抵鸭绿江中游右岸辑安城及其附近上空，盘旋侦察十余分钟。……有美国P-51飞机三架及蚊式飞机一架共四架，飞抵鸭绿江上游右岸临江城及其附近大栗子车站地区上空，先在大栗子对车站扫射两分钟，继在铁路线上扫射两分钟，击坏机车—辆。十一时……又来美国飞机四架，对江桥一带扫射十一分钟，击坏机车两辆，客车一辆，守护车一辆，伤司机一人，居民一人。十四时，有美国B-29飞机一架，飞抵鸭绿江下游右早安东上空，金走侦察一周。十六时，又有美国P-51飞机两架来安东机场上空，扫射两分钟，伤工人十九名，死亡三名，击坏卡车两辆。”
你要说高空投弹去炸大桥，风一吹，偏个几百米飘到中国这边，这不是没有可能。但你告诉我战斗机飞过那么宽的一条江来扫射，还不止一次，恐怕怎么样都不能说是“误射”了。
至于有朋友认为美军轰炸、扫射中国城镇一是为了试探，二是为了报复美军飞机的损失。那么我得要说明一下，苏联空军最早参与朝鲜战争是在1950年11月1日，这才有中国机场起飞的飞机击落美国飞机的事情。很显然，上表中的这些都不可能是因为美军要报复自己飞机被击落。
至于有人说美国人高空轰炸，有可能看不清河流。我这么说吧，当年又没有GPS，定位全靠地图和目视观测。他们是怎么在高空瞄准目标投弹的呢，靠的是下面这个东西：诺顿轰炸瞄准具
投弹手手工装订航速、风速，然后目视瞄准目标，然后投弹。那个目镜是带放大倍数的。
如果连条河都看不到，还炸个毛线桥啊……
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我们最后来看看一些朋友引以为“美军真没想攻击中国”的那位Nicolas Loveless的陈述：
The forgotten war
As a reservist recalled to active duty in 1950, I was assigned as an aerial gunner on a B-29 in the 372nd Bomb Squadron, 307th Bomb Wing, at Kadena Air Base in Okinawa, and flew combat missions over North Korea. By April 1951,it became apparent that Gen. Douglas MacArthur, supreme military commander in the Far East, fully intended to carry the offensive to Manchuria and the three B-29 groups in Japan and Okinawa would be designated to do so. By now, more than 500 MiG-15s were stationed at scattered airfields along the border in Manchuria.
We had already bombed the bridges over the Yalu River connecting Antung, Manchuria to Sinuiju, Korea, and had been attacked by MiG-15s, but the bridges had been partially repaired and troops and supplies continued to flow.
On the afternoon of April 11, 1951, a mission was posted for early the following morning, April 12, but no briefing on the target was scheduled, which was unusual.
I was designated to fly as tail gunner in the B-29 with Col. John M. Reynolds, commander of the 307 Wing, who would lead the mission. We assisted the ground crews to load our plane with 144 100-pound bombs, which were usually used against airfields. We were convinced something big was about to happen and that MacArthur might defy the president and send this mission to Manchuria.
That evening we were ordered to unload the 100-pound bombs and re-load with 40 500-pound bombs. It was apparent the target had been changed. Briefing was then called and it was announced that the target would be a return to the bridges at Sinuiju.
即便是在一些朋友引述的1951年4月12日的那次轰炸，其实本来的目标也是中国境内的机场，而可能只是因为麦克阿瑟4月11日被撤职，才导致了目标被换回中朝边境的大桥。
编辑于 2015-03-16
[14]1950年8月27日《周恩来外长致美国国务卿艾奇逊电-严重抗议美国侵略朝鲜军队的军用飞机侵入我国领空并扫射我国人民》及《周恩来外长致联合国安理会主席马立克及秘书长赖伊电-要求制裁美国侵略朝鲜军队的军用飞机侵入我国领空的严重罪行》，《中美关系资料汇编》，第二辑，上册，世界知识出版社，1960，146-149页。
[14]1950年8月27日《周恩来外长致美国国务卿艾奇逊电-严重抗议美国侵略朝鲜军队的军用飞机侵入我国领空并扫射我国人民》及《周恩来外长致联合国安理会主席马立克及秘书长赖伊电-要求制裁美国侵略朝鲜军队的军用飞机侵入我国领空的严重罪行》，《中美关系资料汇编》，第二辑，上册，世界知识出版社，1960，146-149页。
看过中国政府的记者招待会新华社央视记者和台上的领导人一个捧哏一个甩包袱的表演吧？
越南北战，没有美军的话， 也不会管