The answer to 10-(-12)/4 x 3 = 19
It honestly depends on their personal situation. Some may have gotten away or looked over (extremely rare and lucky), and some may have just survived.
The body is insane and will do anything keep us alive - that's it main job. Some people who go into shock manage to survive, as their body shuts off any unneeded parts - mental awareness, etc. Some people also may have just gotten lucky, and their bodies may have lived through what they went through.
The two that met to discuss terms of surrender were B. General Lee and General Grant on April 9th, 1865. I hope this helps :)