Napoleon III, moved by Phan Thanh Giản's plea, accepted to return the provinces in exchange for a war indemnity, an agreement to station troops in Saigon, My Thau and Thủ Dầu Một, and recognition of French military protection.

[2] When France invaded the rest of the southern territories in 1867, Phan Thanh Giản chose to avoid armed resistance and failed to defend the citadel of Vĩnh Long,[7] waiting for orders that never came, resigned from his position and took his own life through poisoning.

Phan Thanh Tap migrated to Vietnam in the early 18th century, along with his family and relatives and settled in the village of Hoi Trung at Bình Định Province.

Upon settling in Vietnam, he married a Vietnamese woman, Huynh Thi Ngoc, with whom his Phan's father, Thanh Ngạn was born from this union.

In 1798, Phan Thanh Ngạn was appointed as the chief supplier for Lord Ánh's (Emperor Gia Long from 1802) navy and was sent on a diplomatic mission to Tourane, but was later shipwrecked at lost at sea.