Variantly: "from the beginning of the breaches" ("peraoth," like "Pharaoh"): Why are all the punishments pinned on Pharaoh's head? Because Pharaoh was the first to subjugate Israel.
(Devarim 32:43) "The nations will praise His people": In the future, when the L-rd brings redemption to Israel, the nations will be wroth before Him, viz. (Psalms 99:1) "The L-rd has reigned; the peoples will be wroth." And this will not be the first time, for they were already wroth in the past, viz. (Shemoth 15:19) "The peoples heard (of the splitting of the sea); they were wroth."