ראה נתתי בידך את סיחון, "See! I have delivered in your hand Sichon, etc.⁠" Nachmanides writes that this address by Moses is a quote from Moses' address to the people commencing in verse 31. Here we are merely told that prior to the campaign Moses did send out spies to ascertain the militarily best way of provoking the confrontation. Once God mentioned the fact that in this instance Israel was to provoke war, Moses did not send any more spies, etc. The reason was that in the event that Sichon would have proved to be in a conciliatory mood, Moses would have violated God's command to provoke war with Sichon. On the other hand, if Moses knew that the messengers dispatched to ask for permission to traverse the land would be rejected out of hand, why did he bother? We cannot answer that Moses sent these messengers from his own initiative in order to comply with the rule that prior to a war of expansion the opposing side must be given a chance to surrender peacefully, as per Deut. That command certainly did not refer to the 7 Canaanite nations of whom he had been told not to allow a single soul to survive! Moreover, normally, the people of cities captured in a war of expansion, authorised by God- would become prisoners of war, slaves, etc, whereas if Sichon had agreed, none of his land would have been touched at all? We must therefore translate the line ואשלח מלאכים in verse 26 as being in the past tense. He introduced the whole story by explaining that God's hand had been involved from the first moment, and that Sichon's refusal had been engineered by God so as to set in motion the scenario that would lead to his destruction, and his people would know that their king himself had been to blame.