Military men 1919... does anyone speak French?!

Recently acquired this postcard which is covered with very faint spidery writing on the back, and since my French is poor I would appreciate some help!

It starts Cher Tien (My Dear?) and is dated 1919. Some of the men are marked in pencil and the writing describes what the marks mean. I've tried to enhance the contrast as best I can, and think it says 'I have marked with a + the friends, * the {workers?}, (apres reprillons enfant = after childish reprimands?)...' and than I'm lost! The guy at the back has an arrow above his head and I'd love to know why he's been singled out!

Thanks

 

As you say, the writing is faint.
+ are les amis, the friends, * les marseillais (mes meilleurs...), the ones from Marseille (my best...). If I am correct I see a mention of aïoli, a Mediterranean garlic sauce, also popular in Marseille. Maybe that is just wishful thinking on my part, I like aïoli.
The +arrow is another mark explained on the back of the card, far right on your last picture.

 

Thank you! It's not easy to read, is it... I'll have a look through the rest of the card to see if there are other references to Marseille. There's no address on it, it's just filled with writing.

Part of it reads like a love letter, which feels very private (probably why it was kept ).

They all look quite relaxed, and there are a few impressive moustaches around!

 

Arrow guy was the author of letter? Just guessing.

 

My first thought too. It is referred to on the back, if anyone can figure it out we'll know for sure.

 

They kind of look like they're finishing a military 'mess' meal and maybe wishing they had some garlic oil on it!!!!!! At least the two guys sharing do!!!

 

They're the ones with the aïoli, I have that same look on my face when I eat it.