1)
Were these 1,000 among the 10,000?
1.
Radak: No.
2.
Radak citing Seder Olam: Yes 1 .
1
Radak: This is difficult. When a verse gives a Klal (encompassing term), and then a Prat, it always teaches something new. If so, they are not among the first ones!
2)
What is the Gevurah of people going to exile? People bound in iron fetters, what war do they make?
1.
Radak citing Seder Olam 25: They were Giborim in Torah - "Giborei Cho'ach Osei Devaro" (Tehilim 103:20). They wage the war of Torah - "Al Ken Ye'amer b'Sefer Milchamos Hashem" (Bamidbar 21:14).