Pulling small trees and brush?

What would be the best way to keep these holly bushes from coming back? I can't pull the root balls as I'm afraid it will compromise the retaining wall on the other

X-treme Skid Steer Tree Post Puller – By CID Attachments

Heavy-Duty Brush Mower - Erskine Attachments

5 Brush Clearing Tools & Equipment for Overgrown Land

Viewing a thread - tree puller

Viewing a thread - tree puller

Brush Grubber Original Brush & Small Tree Stump Root Puller Remover Tool (3 Pack)

Pulling out small trees with the Brush Grubber

Heavy-Duty Brush Mower - Erskine Attachments

The Brush Grubber Post and Tree Puller by Brush Grubber is the perfect tool for removing your unwanted brush and small trees. This simple-to-use

Brush Grubber Post/Tree Puller, 6 in. Diameter Posts and Small Trees BG-10

How To Clear Overgrown Land - Grit

Pulling small trees and brush?

Tree Puller Attachment • Virnig Mfg

Long Term Report: DR Tow-Behind Field and Brush Mower - Grit

5 Tools For Clearing Overgrown Land – Mother Earth News