1)
What is the meaning of "Isru ha'Susim"?
1.
Radak: This is [harness,] like "va'Yesor Es Richbo" (Shemos 14:6).
2)
Where should the cavalry ascend?
1.
Radak, Malbim: They should mount the harnessed horses.
3)
What is the meaning of "Mirku"?
1.
Rashi: This is like "u'Morak v'Shutaf 1 " (Vayikra 6:21).
2.
Radak: They should clean the spears from rust, and polish them.
1
Here, Rashi equated this to a French word for polishing. In Vayikra, Rashi equated u'Morak to a French word for cleaning. (PF)
4)
What are "Shiryonim"?
1.
Radak: They are iron garments (armor) composed of rings.