Err.. Sort of...
But I would recommend to use:
Traps
Since your country is on the defensive, I suggest going to a more defensive style of fighting. I don't know what do you mean by weapons made of ice. But since the magic powers are limited in your world, I don't know how ice-smithing (if such a thing exists), really works.
Therefore, Traps would be perfect in this scenario.
For instance, your people can make
- Pitfall traps that are made from thin sheet of ice that utilize Iron Spikes or
- Ice spikes in conjunction to pitfall traps
- For indoors, Stalactite style traps - your people can cast their minor levitation skill to attach them to the ceiling and put some kind of trigger to release it
- Trap doors made of ice (works like pitfall) - but manually triggered to open with help of levitation skill, or some minor fire skill, etc.
- Blizzard - if your people can cast flame spells I assume they can also cast ice spells. I assume there's always snow in your country but if you could somehow make man-made blizzard it could also work.
Edit:
- Avalanches as @Nicolai suggested, could also be taken advantage of based on the terrain.
I'll try to edit this post if I could think of more.
