Lord God Came To The World Of Immortal Cultivating

It starts with Shih Wen who is into some…you know, illegal stuff. He designs fake CPUs for a phone factory, and one day, the factory is bombed and he dies.
Shih Wen wakes up to a frightful sight. He finds himself in the midst of dead bodies, bodies of soldiers who have been torn to pieces by wolves and rhinos. 
It is damn bloody.
He has definitely transmigrated, and not into a palace where he would be attended to, but into war.
Shih Wen is still trying to make sense of all of this when the soldiers who are still alive start to ask him what they should do next. It is at this point that it dawns on him that he is the commander of the army.
How the hell did he go from a CPU guy to a commander? A weak-ass commander!
Shih Wen pulls the army together and stumbles over the dead body until he gets to his room. Right there, he finds his diary, the diary which should answer all his questions.
Question is, does it?