I'm feeling rather shaken, having just watched "They Shall Not Grow Old" on BBC4.
If you've already seen it you'll understand: if not, the film director Peter Jackson took thousands of hours of WW1 footage, cleaned and colourised it, and cut it in with genuine recordings of WW1 soldiers.
The result is, to me the most extraordinary film I've ever seen.
I imagine that many of the regulars on this site will have had close family members who experienced this war or were lost in it.
The film is a very immediate way to understand a what they suffered and how they endured it, and as a a way to honour them I cannot recommend it enough.
https://www.bbc.co.uk/iplayer/episode/b0brzkzx/they-shall-not-grow-old, not sure how long it'll be available - I hope for ever!
I've bought DVD copies to give to my kids and my friends.
Yours faithfully
KT17
PS My grandfather Matthew Henry Davies OBE (M), DFC - his job was to lie on the floor of a biplane crate, peeking through a spyhole, looking at and recording the battlefields to send military intelligence back to Army Command. He never spoke of it nor ever wore his medals. We only found out on recently discovered diaries. He survived the war but died a few months before I was born. I was named after him.