French language Q&A Forum

I lost marks more for the wrong word or phrase rather than the wrong grammer. Most of the grammar details for each section I had got right or nearly. I don't know if there is any way of helping us to know or guess the correct form of words.

It's all good practice though, so thanks.

When do you use this construct? I see it in the example. 

Bonjour Madame,

I was attempting this quiz on this link- https://french.kwiziq.com/my-languages/french/tests/take/1768714 but was unable to get the last sentence.

- Alors nous devons compter sur ceux qui se battent à nos côtés et que je suis fier d’appeler mes collègues.

Why ‘que’ has been used? Can’t dont be used to mean ‘of whom’?

Merci d’avance !