I don't know what they're trying to show here, it's not realistic at all, as for the gore and events it is acceptable and accurate, because
First of all: the environment
it is nothing like sabahan village in the first battle at the rurals. As for the people/villagers are included, it is nothing like sabahan, even if they do not show any sabahan officers/fighters there at least show who's in dangerous situations and who's they're trying to protect.
Second: the antagonist (Sulu king)
Historically, yes they do speak Malay like Brunei, to be accurate as possible but their portraiture is nothing alike it, more to some random kind of Malay gangster
Third: the storyline
Like I said, I don't know what they're trying to show, and weirdly enough, it's not accurate at all, I can barely say 70% of this arent actually happen like how they potrayed, like don't they ask advice or the true story from the ones who experienced it??
Fourth: the lack of pride
Honestly, I should say this movie is not good because they don't know what they're showing, it is nothing like mat kilau, pendekar Awang, bukit Kepong, leftenan Adnan or sarjan hassan. Because those ones didn't actually show random things they're doing in their daily lives (such as: "when you're going get married?" & "What if your child is a girl") but rather focusing on the pride and true memorial of the heroes.
Overall this movie definitely need higher improvements on the storyline and hidden messages as I've seen almost no hidden messages they're pointing up to. But you're into good action and fighting choreography, I recommend you to watch it, but if you're into patriotic pride like me, I suggest not to watch it as it would disappoint you if you're read the actual events from the documentary.
I give this movie solid 4/10 only good in cinematic and action.