On February 21, Goshirakawa went on an imperial visit to FUJIWARA no Akinaga's residence in the Horikawa area of Hachijo (Eighth Avenue), but as he was sightseeing from a box set up alongside the Hachijo thoroughfare, he suffered harassment in the form of some trees that were sent crashing down from outside the box to obstruct his view.
正月6日上皇が八条堀河の藤原顕長邸に御幸して桟敷で八条大路を見物していたところ、堀河にあった材木を外から打ちつけ視界を遮るという嫌がらせを行った。 - Wikipedia日英京都関連文書対訳コーパス
To provide box-shaped strong earth retaining fences capable of dynamically retaining earth even on a steep slope, of permitting to plant small and medium-sized trees even on sloped land and of strongly resisting against damage from snow. 箱状の土留め柵で急な斜面でも力学的に丈夫な土留めができ、傾斜地でも小中木の植栽が可能で雪害にも強い土留め柵。 - 特許庁