So you're saying that throughout history, most people have moved to another country without knowing a word of the native language? They go entirely unprepared?
Alright, you win.
I'm the unreasonable one
There are obviously 'degrees' of knowledge with respect to a language. You can obviously only learn so much without actually 'living' the language, but the fact remains that you at least have to grasp the basics before 'immersing' yourself.
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All refugees are immigrants. Not all immigrants are refugees.
Given the thread title, I'm referring to immigrants in general. Refugees do not account for many or even 'most' of all immigrants.