Mezue ahịrịokwu na-esonụ: Mgbe Agha Britain na France tiwapụrụ na 1778, Grenier nọ na-eje ozi n'ụgbọ mmiri "Sphinx" nwere egbe 64. O sonyere na Agha Ushant, wee nyezie ya iwu nke frigate "Boudeuse" na ndị agha n'okpuru Estaing. Na 22 Jenụwarị 1779, o jidere ụgbọ mmiri ndị Britain bụ "Weazle". O so lụọ Agha Grenada na
Nchịkọta Savannah na Septemba 1779. N'afọ 1780, ọ nọ n'ọrụ ilekọta ndị njem. A buliri Grenier n'ọkwa onye isi n'ụbọchị nke 9 n'ọnwa Mee n'afọ 1781, ma jee ozi n'ụgbọ mmiri "Bretagne". Mgbe ahụ, ọ rụrụ ọrụ n'ihe onwunwe maka ndị agha Guichen.