Valmiki Ramayana Bala Kanda Sarga 39 Shloka 18
Original Shlokaशूलैरशनिकल्पैश्च हलैश्चापि सुदारुणै:। भिद्यमाना वसुमती ननाद रघुनन्दन।।1.39.18।।
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रघुनन्दन O Rama, अशनिकल्पै: similar to thunderbolt, शूलै: with lances, सुदारुणै: which were dreadful, हलैश्च with plough, भिद्यमाना being broken, वसुमती earth, ननाद emanated sounds.
O Son of the Raghus (Rama) dreadful sounds emanated while the earth was being broken open by ploughs and lances similar to thunderbolt.