This is they way I do it.....
When (G)all beside a (C)vigil keep, the (D)west's asleep, the (G)west's asleep
A(G)las and well may (C)Erin weep when (D)Connaught lies in (G)slumber deep
There (G)lake and plain smile (C)fair and free 'mid rock their (A7)guardian chival(D)ry
Sing (G)oh! let (D)man learn liber(Em)ty from crashing (D)wind and lashing (G)sea

I think Johnny McEvoy does the last line like this......
Sing (G)oh! let (Am)man learn (D)liber(G)ty from crashing (D)wind and lashing (G)sea