Pedzisa mutsara unotevera: Mukati maSeptember 1950, Segrétain akazivisa kutungamira kwenzvimbo nhatu dzakasimba dzezvombo apo varume vake vakanhonga zvisaririra zvavo pamuganhu. 1er BEP yakagamuchira basa rekudzorera guta reDong Kje pamugwagwa wekoloni 4 (RC4) apo ichivimbisa kubatana neThat Khe iri makiromita makumi maviri kumaodzanyemba. Achitarisana nomuvengi mukuru muuwandu, 1er BEP yaizofanira kuita kufamba yakananga ku cuvette yeCoc Xa; yakakomberedzwa nematombo nemiti, 1er BEP (I kuumbwa) yakapa yekutanga
Nzvimbo yehondo yechinyakare yeLegion yeVatorwa yeHondo Yokutanga yeIndochina mukati mayo battalion yose yakaparadzwa. Mutungamiriri webatirioni "Chef de bataillon" Segrétain akatungamirira boka rake kusvikira pakuedza kwake kwokupedzisira. Pierre akafa nemaronda ake akaipisisa mukati mehusiku hwa7 kusvika 8 Gumiguru 1950, apo vapukunyuki vakanga vasara vebato vaive vachipinda mumitsara yevavengi kuti vadzore That Khe.