quote this message to see the proper code to embed an image, also need the direct link to image (Right-click -> Open image in a New tab)
(The "Img" in the "Post a Reply" UI will place this automatically if you have the link highlighted.)

Looks like the problem is simply the angle. Try approaching the banner from as directly opposite to the ladder as possible. If that doesn't work, it's FUBAR I'm afraid. (Without breaking the ladder.)
You can try building a
Wrecking ball.
(If the previous banners didn't require you to stack directly on top of the banner, make sure you aren't actually clicking any of the Palisades or the Ladder with your Destroy cursor instead.)