Timothy Cray, prosecuting at the Danny Nightingale retrial, has said: "No soldier, no matter what his experience or the unit he is attached to is above the law."
The prosecution say the defence will claim that Sergeant Nightingale's earlier admissions to the offences are unreliable and that someone else could have put the gun in his wardrobe and ammunition under his bed.
Their claim of unreliability is put down to memory difficulties he says he suffered.
More top news
Mladic, now 75, was the military commander of Bosnian Serb forces in the 1990s, who fought against the Bosnian Croat and Bosniak armies.
Weather: Heavy rain and strong winds in the north
His representatives said Cassidy, who was hospitalised last week, died "surrounded by those he loved."