@MrMinerGuy142Dreadnoughts are not a kind of battleship.
You said 'fleet engagements.' That sounds as if it was a fleet versus fleet engagement.
Also, no pirate would be stupid enough to stick around long enough for a fleet to get close and eliminate them- same with a scout or smaller fleet. When faced with overwhelming force and no certain restrictions on technology, any ship or fleet will jump or warp out ASAP.
783 engagements where weapons were required is ludicrous, especially in
space. Space is not a two-dimensional area, where you can go into a new area, open up a spy glass and see anything else nearby because it's outline shows up on the outline- not at all! In space, a three-dimensional vastiness of nothin'ness, people with advanced stealth technology- which pirates are more likely to have, rather than giant battleships, if the zones are actively patrolled by the Navy- could be behind you, below you, above you, to your left, to your right, and anywhere from one kilometer away to several hundred lightyears away.
The simple fact is, 783 engagements on a waterbourne navy would be pressing it a bit. 783 engagements on a spacebourne navy would be even more wild.
Go play World of Warships- that is a 2-dimensional battle. you can only go north, south, east, and west. Same with the enemy. Now, use your guns, and fire randomly. The chances are very, very, very little that a random shot will hit an enemy ship. Now make that map a billion times larger, or even more than that, because space is just
that big, and then pretend that those shots you have can travel a hundred times longer, three times faster than before. The likeliness that you will hit anything is even less as large.
You can't just show up at a moment's notice, of course. No fleet can mobilize instantly, even if it was on red alert. By the time you get there, which can be anywhere from several hundred kilometers away, still in orbit around the same planet, to several hundred lightyears away, into the orbit of a completely different planet in a completely different solar system, it's very likely that the pirates, scouts, or whatever else that was sighted had already left.
That, and pirates would likely have jamming equipment, or fire on communications arrays to prevent ships from transmitting.
Now, I'm terribly sorry that I'm doing this, but I think it's really quite needed, because it's really quite ludicrous.
Your character is in engagements mostly with pirates with scouts. Except... the military doesn't count a General's engagements by how many battles he has fought, and his underlings have fought on their own. That being said, it's also very unlikely that he's won every single engagement. Scout ships are lightly armed, lightly armored, and very fast and manueverable- their purpose is, as their name suggests, to scout and collect intelligence. An actual pirate ship versus an actual scout would like end with the scout's burning ruins, or with one or the other warping away.
So no, I refuse to see that your very young character has had such an amount of battles he's been through, and it's not of military custom to count a man's battles by the ones he fought, plus the ones all his underlings fought without his presence. Now if he said, "There's a military force, Battle Group C go around and attack from behind, improvise as needed," then the battle where rushes the Enemy A, with his Battle Groups A through C, that would be counted as one battle. If a scout around the outskirts of battlegroup is attacked by a pirate ship, and the scout flees, it is not a victory. If the scout somehow beats the pirate ship, then the scout's victory isn't marked under the general's resume.
Edit: I believe you are wrong, and unless I get a rational, realistic answer as to why it is so, and how it is so, then I refuse to accept your character as realistic or legitimate.