hi im new to the game i have a question

[victoriakeller]

sorry if this question is a bit stupid, anyways i wanted to ask at what missions i get stuff like the hummel or wespe, ive played through easy mode on the first 3 missions, and for artillery that can do actual indirect fire all ive had is the mortar so far, so at what mission do i get stuff like the hummel and wespe?
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