Walmart has opened two more fronts in its siege of Amazon’s walled garden. They announced a program to provide home delivery for other retailers, leveraging the infrastructure they developed for their own use. The deal adds scale economies and strengthens Amazon competitors. Walmart also teamed with The Trade Desk to provide a demand side platform (DSP) that makes it easier to target ads at Walmart customers via in-store, Walmart digital properties, and third party publishers. One big advantage: advertisers can look at Walmart sales to measure ad results.