Assyria can't save us. We won't ride on horses; Neither will we say any more to the work of our hands, 'Our gods!' For in you the fatherless finds mercy."
"True repentance involves abandoning known sin; and here the double sins of relying on nations and idolatry are confessed."[14]; "We will not ride upon horses ..." is supposed to be a metaphorical way of declaring that, "neither can Egypt help us."  Egypt was the principal source of the world's war horses in those times.