Context = I'm new to this community and as a history task I was asked to find out what my great grandparents did in the war/wars. So I've got two questions as I can find little online about both.

1. WW1. One of my great great or great grandparents was a royal marine or RND as it says in Gallipoli during WW1 although I'm struggling to find any information about him or what happned all I know is that he passed away in something called the third battle of al kiritha.
2. WW2. My great grandfather who I knew and survived war didn't talk about any of his experiences all I know is that he was part of something called Force 136 according to my mum who knew him best.

Any help would be great as I can't find much information on both of them

Many Thanks