Thereat

“Surely,” said I, “surely that is something at my window lattice; / Let me see, then, what thereat is, and this mystery explore—

Source: wiktionary

The Stafford Railway, which connected this important canal with Stafford, was opened on November 1, 1805, and "the immediate result was a reduction in the price of coal at Stafford, and there was some public rejoicing thereat."

Source: wiktionary

Old Deacon Smith was quick to see the impression made by Abby Howard upon the mind of his son, and he was wonderfully pleased thereat, for Abby was the oldest daughter of the good Deacon Howard, and was herself a church member, and pious. He had more hope for his son now, than he had felt for years.

Source: wiktionary

Then said the gods, “Earth is no place for laughter.” Thereat They strode to Pegāna’s outer gate, to where the Pestilence lay curled asleep, and waking him up They pointed toward Harza, and the Pestilence leapt forward howling across the sky.

Source: wiktionary