Ireland have accounted for Tonga 59-16 and accounted for all fingers, toes, arms and legs in mostly good order after a successful Rugby World Cup gamble.
World No.1 Ireland risked their first team for a second straight match to build a head of steam for their showdown with defending champions South Africa next weekend in Paris and it paid off. Backup tighthead prop Finlay Bealham came off and appeared to be the only injury.
Ireland's key players got through unscathed, they got the bruising hit-out needed, and a Tonga team self-described as its best ever was taken apart clinically in Nantes on Saturday.
As a bonus, captain Johnny Sexton tallied 16 points and passed Ronan O'Gara and Neil Jenkins to go fourth on the all-time international points list with 1090, while also taking the Ireland record from O'Gara.
Sexton was rested at halftime and watched his teammates almost double a 31-13 interval lead.
Sexton, critical to Ireland's success, has scored three tries and slotted 12 of 13 goalkicks in two World Cup matches after six months out.
Having thrashed Romania 82-8 last week, Ireland extended their winning streak to 15 Tests on Saturday and look ready to meet the Springboks in a match likely to decide who tops pool B.
"We're delighted to get five points against a very good team," Sexton said. "That was the main objective. We did it, and we'll concentrate now on a massive game next week. Playing against the world champions is going to be really special."
A lot of attention on Tonga was paid to four former All Blacks in an experienced team. Tonga's average age of 29-plus is second in the tournament only to South Africa. But in their first game, they weren't sharp and the defence was ragged.
Still, Ireland needed every drop of their own considerable experience to contain them, and were ruthless against Tonga errors.
Ireland took until the 21st minute to score their first try of eight in total, finished by Tadhg Beirne after Sexton switched play to Caelan Doris bursting off a ruck.
Flyhalf William Havili's second penalty kept Tonga in touch at 10-6 but teammate Solomone Kata made two costly errors that Ireland used to skip away.
Kata's late charge into James Lowe conceded a lineout that Ireland mauled to the line for Doris' try. Then Kata's kick out on the full gave away another lineout after which Australian-born winger Mack Hansen scored a brilliant solo try. Ireland beat 17 defenders in the first half and Hansen beat at least six in his run.
Half an hour in, Ireland led 24-6 after three converted tries. Two other tries weren't given due to a knock on and a try-saving tackle by Havili.
Thanks to the hard-carrying forwards, Sexton's and halfback Conor Murray's 69th Test together was one of their best. Murray could snipe, and his break with Garry Ringrose in support put Sexton in between the posts.
Tonga responded with their best plays of the night, causing a professional foul by Peter O'Mahony, whose yellow card was Ireland's first in 14 months. Tonga finally got a try by No. 8 Vaea Fifita charging off a scrum.
Ireland showed the range of their options after halftime with more tries by Lowe, Bundee Aki, who got two, and Rob Herring.