Attempt to expand the series but came at expense of the action
Part 1 of Season 4 is about political intrigue and rivalries across Scandinavia, England and France. That leads to a bit of a disappointing start as there are no big fight scenes just plotting, backstabbing and a lot of sex. Halfway through however the battle returns as the Vikings sail on Paris once again.<br /><br />I think this was an attempt by the writers to expand the series. It was only half successful however. I would’ve liked more action at the start. Still it was far better than most things that were on TV at the time.
The movie title "Vikings Season 4 [DVD]," available on Movies & TV, has received an average rating of 4.8 from 10938 reviewers. 
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 {"Genre": "Action & Adventure/Television, Television", "Format": "DVD, Subtitled, NTSC", "Contributor": "Travis Fimmel, Clive Standen, Alyssa Sutherland, Gustaf Skarsgard, Katheryn Winnick", "Language": "English", "Number Of Discs": "3", "Aspect Ratio": "1.78:1", "Is Discontinued By Manufacturer": "No", "MPAA rating": "NR (Not Rated)", "Product Dimensions": "0.6 x 5.3 x 7.4 inches; 4 Ounces", "Item model number": "42927129", "Media Format": "DVD, Subtitled, NTSC", "Release date": "October 4, 2016", "Actors": "Gustaf Skarsgard, Alyssa Sutherland, Clive Standen, Travis Fimmel, Katheryn Winnick", "Subtitles": "French, English, Spanish", "Studio": "WarnerBrothers", "Number of discs": "3"}

Here is a brief synopsis of the title : VIKINGS: SEASON 4 - Volume 1 - DVD - Take another gripping voyage into the ruthless world of Vikings, with it's thrilling action, powerful performances and intriguing story line. King Ragnar returns from battle gravely ill. Disheartened by his marriage to Aslaug and challenges with his sons, Ragnar seeks companionship with his slave Yidu. Meanwhile, a defiant Rollo remains in Frankia, Queen Kwenthrith plots to reclaim Mercia, and the enigmatic Harald Finehair appears. Ultimately, Ragnar and Rollo engage in a merciless battle to define their legacies. Disc 1: "Good Treason, A", "Kill the Queen", "Mercy"; Disc 2: "Yol", "Promised", "What Might Have Been", "Profit And The Loss, The"; Disc 3: "Portage", "Death All 'Round", "Last Ship, The", "The Transformation of Rollo", "The Viking Seafaring Prowess". The first 10 episodes from the fourth season are presented in a three-disc set. 7 hrs. Total. Widescreen; Soundtrack: English Dolby Digital 5.1; Subtitles: English (SDH), French, Spanish; featurettes..