Passage
And Jehovah will do unto them as he did to Sihon and to Og, the kings of the Amorites, and unto their land; whom he destroyed.
And Jehovah will do unto them as he did to Sihon and to Og, the kings of the Amorites, and unto their land; whom he destroyed.
Deuteronomy 31:2 And he said unto them, I am a hundred and twenty years old this day; I can no more go out and come in: and Jehovah hath said unto me, Thou shalt not go over this Jordan.
Deuteronomy 31:3 Jehovah thy God, he will go over before thee; he will destroy these nations from before thee, and thou shalt dispossess them: [and] Joshua, he shall go over before thee, as Jehovah hath spoken.
Deuteronomy 31:4 And Jehovah will do unto them as he did to Sihon and to Og, the kings of the Amorites, and unto their land; whom he destroyed.
Deuteronomy 31:5 And Jehovah will deliver them up before you, and ye shall do unto them according unto all the commandment which I have commanded you.
Deuteronomy 31:6 Be strong and of good courage, fear not, nor be affrighted at them: for Jehovah thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee.
The verse centers on "jehovah", "sihon", "kings", "amorites", "land", and "destroyed". It is saying that the verse draws attention to "jehovah" and "sihon", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 3's "Jehovah thy God he will go over..." into verse 5's "And Jehovah will deliver them up before...", so "jehovah" and "sihon" belong inside that flow. In Deuteronomy context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "jehovah" and "sihon" with trust shaped by these words, not by a vague optimism outside the passage.