vo nguyen giap was the last of vietnam's old guard revolutionaries. in 1954, at dien bien phu, giap effectively ended more than 70 years of french colonial rule. he went on to fight american forces, and ultimately conquered south vietnam after the u.s. withdrew. more than a million of his own troops died in the process. vo nguyen giap was 102 years old. >> woodruff: still to come on the "newshour": the tragic tale of migrants fleeing the african continent; the digital currency known as bitcoin; twitter goes public; the man who saved the government $1 billion. plus, david brooks and e.j. dionne. >> woodruff: we return now to italy where after thursday's migrant boat shiprwreck, hundreds are feared dead and search efforts have been suspended. we have a report narrated by jonathon rugman of "independent television news." >> reporter: they came to europe fleeing war and poverty and ended up nearly drowning, tantalizingly close to the mediterranean shore. italy's coast guard rescued these two african migrants, but it's reckoned more than 300 may not have s