Here it is as I learned it (in English !) from a native Gaelic speaker at a Pan-Celtic, many years ago :

High upon the Benachie (Beinn a Chie ?)
On a day of days
Seawards I gazed, watching Keishmul's galley sailing
Ohee, Oh Hoo - oh
Folaroh

Bravely homewards she battles 'gainst wind and tide.
No moors nor ropes, anchor cable tackle has she.

Now at last 'gainst wind and tide they've brought her to
Neath Keishmul's walls - Keishmul's castle, our ancient glory.

Here there's wine and feast for heroes ; sweet harping too
O hee O hoo
Sweet harping too, O hee oh.