You can wait until the OS commences. Important thing is that boost is active at the moment of reaching the enemy.

On a side note: this also goes for for example yieldig boost. If boost runs out *after* your troops are sent and *before* they reach layer, the boost is not active on that layer.

* Attack, defend, yield: before reaching target.

* March, build, learn: before starting process.

* Will to Live: before troops are killed.

In an OS one typically make sure everyone has put boosts on in chat – then initiator execute the onslaught and boost the march.

How ever, even then it is not certain you won't waste boosts:

[borkof]: Anyone else want to participate?

[simla]: No, let's go

[gandalf]: I want, wait for me to change shaman

[simla]: hurry up, my boosts are running

[gandalf]: I'm in

[borkof]: Everyone boosted and in attack gear?

[yodol]: Oh, crap, I'm in building gear

[simla]: f***! Only have 3m left on boosts.

[yodo]: OK. I'm ready

[simla]: I need to put on new boosts

[simla]: OK, ready

[miimi]: Can I join?

[simla]: …

- 3 minutes later -

[borkof]: OK. Everyone boosts on, Here we go!

[simla]: hahah he shielded

Mee said:

https://plarium.com/forum/en/vikings-war-of-clans/general-questions/104112_help-with-os-results-analysis/

You might wanna peruse this thread. Your SPECIFIC question is answered near the bottom of the first page.

Thanks a bunch that answred the question 

UVUCA Thank you too 
(but I liked the first answer better, before you edited it.... only regarding OS)

UVUCA said:

You can wait until the OS commences. Important thing is that boost is active at the moment of reaching the enemy.

.........................................

In an OS one typically make sure everyone has put boosts on in chat – then initiator execute the onslaught and boost the march.

---

I think the above answers it regarding OS.... Just what I wanted to know..... That you can put boosts on anytime after joining OS but before execution   (Good routine for the former of the OS to tell in chat to check boosts before go)

You can wait until the OS commences. Important thing is that boost is active at the moment of reaching the enemy.

On a side note: this also goes for for example yieldig boost. If boost runs out *after* your troops are sent and *before* they reach layer, the boost is not active on that layer.

* Attack, defend, yield: before reaching target.

* March, build, learn: before starting process.

* Will to Live: before troops are killed.

In an OS one typically make sure everyone has put boosts on in chat – then initiator execute the onslaught and boost the march.

---

How ever, even then it is not certain you won't waste boosts:

[borkof]: Anyone else want to participate?

[simla]: No, let's go

[gandalf]: I want, wait for me to change shaman

[simla]: hurry up, my boosts are running

[gandalf]: I'm in

[borkof]: Everyone boosted and in attack gear?

[yodol]: Oh, crap, I'm in building gear

[simla]: f***! Only have 3m left on boosts.

[yodo]: OK. I'm ready

[simla]: I need to put on new boosts

[simla]: OK, ready

[miimi]: Can I join?

[simla]: …

- 3 minutes later -

[borkof]: OK. Everyone boosts on, Here we go!

[simla]: hahah he shielded