A childhood belief about misheard lyrics

I attended a French-immersion school, so at the beginning of the day we sang the French version of O Canada. I understood most of it, but I didn't get a few parts.

I thought "car ton bras sait porter l'épée" (your arm can bear the sword) was "...sait porter la paix" (can bear peace), which is much nicer, after all.

In the line "ton histoire est une épopée des plus brillants exploits" (your history is an epic of the most brilliant exploits) I thought an "épopée" had something to do with poppies. This went nicely with the "fleurons glorieux" a few lines previous, and had the side benefit of going nicely with the poppies we wore on Remembrance Day (to remember our brillants exploits, naturally).

Finally, I thought "et ta valeur de foi trempée" (and your valour, steeped in faith) was "deux fois trompée" (twice fooled). I figured dear old Calixa Lavallée must have had very definite opinions about the First and Second World War!