[TOMT][GAME] Help me remember my first video game (DOS)!

I try to remember the name of a game that I have very faint memories of. I think I played it round 1992, I was 5 at the time. Besides Commander Keen 1 it was the very first game I played on my dad's DOS PC.

As I mentioned, the memories are not very clear, sorry about that. But maybe it is enough for someone to know what game I mean.

It was a sidescroller that started you outside of a building (maybe a fort). It definetely was night and had an overall dark theme. The first enemies you were attacked by were some kind of birds or bats. I also remember having some kind of health, but it was very limited. I think I didn't get past the first view levels.

I know that's not much to go with...

• DOS
• Sidescroller
• At night
• Outside a building
• Fences, trees, gras/bushes
• Birds/Bats
• Health (red bar?)
• Played as some kind of knight?