Maybe dumb luck or he had good commanders? I'm more concerned about if he'll be able to hold the North, and that won't be easy.

I don’t think holding the North will be that much a problem. There’s no one left to oppose him, and he even starts reforms such as strengthening the military and industrialising. Dijkstra would make the North powerful, so he’d probably be more likely to keep it united than Radovid, in the long term.

So far...

I don't think so. Dijkstra will have a huge succession problem. And when we look to Radovid what did to redania it is perfect. When he took the country Redania was nearly divided. But he dealt with traitor lords,made military reforms and in just a 2 year he made Redania a country which can resist the nilfgaard alone. Both in the field and economically. When we look the ending cutscenes it says Dijkstra starts reforms and industrialization but we know small information about Radovid's northern empire. He made Redania stronger then ever,probably he will make the North a powerful empire. only thing ending says Radovid continued his witch hunt but when the hunt end he is 22. We don't know anything after this. He has time for start reforms,etc and when we look his rule probably he will. Radovid is a ambitious man. He wants to be more powerful and he is smart enough to know the North needs some reforms and these reforms will make him stronger.

^ And you have doubts that Dijkstra will be able to keep that going in the ending where he gets the North?

I certainly don’t have any doubts, for reasons stated above. I doubt Dijkstra would have “succession problem” either. For one, he already has his own wife and children, I believe. Also, if he’s the ruler of a newfangled Northern Empire, he’s the most powerful man in the world, so he can create his own dynasty if he likes and marry who he likes. Same goes for Radovid, so I don’t think there’d be much difference between them in that regard.

Well the only way to find out for sure is to wait until a 4th game is announced, or an announcement where there will be no 4th game. Who knows? Maybe Nilfgaard wins.

He was the head of secret service in the books. Hes an espionage genius. Probably intel won the war for him.

Remember Geralt saying Emyr having problems with inner politicans , so Djikstra using this weakness of nilfgard ... he dont need to lead redenian army . he is helping the lords who hate Emperor and they dethrone him with spys of redenia . also (Ending SPOİLER) Thats why Emperor wants ciri to be Empress he dont wanna see this haters anymore .