The Story so far i know
The German Empire demand Free passage of there Army true Belgium
Belgium King Albert 1 refused, Belgium was neutral do two Treaty the sign with Britain and France in 1839 and 1848
On 2. August 1914 The German Empire gave Belgium a Ultimatum.
Demanding declaration of Belgium government to stay passive during passage of German Army. they refused
on 4 August the German Army invade Neutral Belgium without declaration of War.
until the 18 August the Germans Army conquers Liege, Namur and Brussel the capitol
what left of Belgium army under command of King Albert 1 went to Fortress of Antwerp, what let to siege of Antwerp city by German Army.
On 25 and 26. August, then on 8 until 13. September 1914 King Albert let
Personally ! two attacks against Germans Troops
One POD were he could be Capture by Germans forces
Oktober 4 the German Army break true and start conquers Antwerp city
On October 6 King Albert 1 give the Evacuation order, the Belgium government try to get to Oostende, while Belgium Army and British BEF brake true German encirclement
During chaos King Albert 1 was separate of his entourage. he and two adjutant went on horse direction to Oostende
another POD were he could be Capture by Germans forces
He reach Oostende but had to move to Ypres as the Germans advance further
Arrested? On what charges? If the Germans do that, they give the Allies justification for arresting the Kaiser if the Germans happen to lose the war.
Cant they (and have to anyway legally) treat him as a POW just another Belgium officer ? (even if of rather high rank)
Of curse he will be arrested, if get caught. he is a Military, at first they will threat him as POW until some one figure out who really is!
The German Army generalissimos demanded reprisal because Belgium refusal and Fight against German Army
what let to a series of Massacre, the city of Leuven, Dinat and Aarschot was pillage and threaten to burn, this was later called the "Rape of Belgium"
having King Albert 1 as POW would be generalissimos triumph
It very likely he is put under house arrest in German Empire and likely to used as mean extortion of Belgium and British Government, see King Albert 1 is related to British royals !
under this situation is realistic that Belgium Government surrendered to German Empire