England will go in search of their third straight win in the 2016 RBS Six Nations as they entertain Ireland at Twickenham.
After two wins on the road, this will be Eddie Jones' first taste of life in charge of the Red Rose brigade at Twickenham, and his team will be confident of victory over an Irish side struggling for form and fitness.
The champions are beset by injuries to key men and field two new caps against the tournament pace-setters.
There are plenty of unknowns on either side. Will Joe Schmidt's patched-up troops be able to produce a performance worthy of the title-holders? Just how good are this England team, having not been truly tested yet in wins over Italy and Scotland?
It's the pivotal midway point of the championship, and we will see lots of questions answered on Saturday.
Let's assess the five key battlegrounds for this clash.