Please help me understand Fatigue

[mrpuck]

Just had a great run going, 5/5 commanders, 3 with veterans or elite upgrades etc. Didn't lose anyone after like 15-20 Islands. Then after I finish an island, I save my gold since I didn't have enough for any upgrades and go to "Next Turn" and it says "1/5 Commanders available".

Now I see the fatigue bar above each commanders name. But there didn't seem like a way to replenish it with gold. I figured they just have to rest a turn, so I only have 1 commander for the next battle (They will surely die).

I click Next Turn and then I instantly lost the game.
What did I do wrong?

And now from what I gather, I need to analyze each island and only take so many commanders and not all of them to allow some to rest?
This is a mechanic that just seems like they overlooked in explanation.

Thanks anyone for helping out the noob. I am enjoying this game though.

[mrpuck]

Just to add, I know when you click Next Turn the map line moves. I usually play and grab Islands up and down. Is the problem maybe I had that I didn't advance far enough right and got swallowed up by this advancement?

[newageofpower]

On higher difficulties you need to be able to advance 2 or even 3 islands every turn to not get run over by the Viking Tide.

[bonusmonster]

not true at all. at every difficulty it is possible to get to the last island even if you only stick to one island at a time per turn.

but yeah you need to stay ahead of the viking frontier, the wavey thing that comes in from the left.

[mrpuck]

Thanks guys, kind of figured that out on my 3rd play through. I guess you simply don't have to capture every island as long as you keep moving forward.